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Old 05-19-2012, 11:57 PM   #1
Infinite-T
 
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ZL1 Diffuser and quad tips. Info and how to thread.

I just recently finished this mod and have gotten numerous questions about various parts and pieces and what exactly I used, didn't use and did and didnt do.

I wanted to get a nice full write up done this weekend but ended up work all day on Sat. and the weather is supposed to suck on sunday. But. I will start the write up now and hopefully add more pictures when I get them later.

So fist off. The parts list;

The ZL1 Diffuser (this included the splash guards which actually are separate pieces).

The Heat Shields (mine were attached to the diffuser when they arrived on my front porch.

The Absorber (which I actually ended up not using. I was lazy and didnt want to take the bumper off to change it. There was only 2 holes I had to re-drill because the did not line up). The absorber can be best described as a plastic skelital frame that goes behing the bumper skin and diffuser. To change it out, I believe you will need to remove the whole rear bumper.

A Quad tip setup. I have the Solo Performance Mach x exhaust and bought the quad tips from Solo too. Steve is great!
http://solo-performance.com/exhaust-...um?tip=T601-3L

A few pictures of the different parts.

Many have asked what the heat shields are/do. They are these black metal plates that attach to the exhaust cut out area. No doubt to protect the plastic diffuser from the hot exhaust. As you can see from the photo below, they are somewhat visible, and in my oppinion, should be used.



The next picture is the splash guards that I mentioned. They actually are a separate piece from the diffuder. You will need to unscrew the back side of the mud shields behind the tires. Then the splash guard inserts behind the mud shield. You can put the top screw back in to hold it in place. Leave the bottom screws out for now, You will need to attach the diffuser wrap-around to the spash guard before you put the other screws back into the mud shield.



Now on to the how to.

1. Remove the old diffuser. There are some 7mm hex screws (6 i think) that screw the bottom of the diffuser to the absorber. Once the screws are out, the bottom of the diffuser will be hanging free. The top of the diffuser is attached by several (8 maybe 10) push in tabs on the diffuser that insert into slits in the bumper skin. They require some force to get them out. But be carefull not to break or scratch anything. Start from one end and work towards the other end. I found a youtube video of this actuall part. If you need it, you can search it. It isnt actually that difficult to do. Just becareful so you dont damage anything.

2. Partially mount the splash guards. As described above in the splash guard description. The spalsh guards insert behind the wheel mud shield. Once you have it in place. Put the top screw in. Leave the others out for now. It will make it easier to attach the diffuser "wrap arounds" to the splash guard.

3. Prep the new diffuser. You will notice the ZL1 diffuser has these "wrap around" pieces that, well wrap around, the underside of the rear fender behind the tire. The diffuser has 6 tabs on each side. Im guessing that the ZL1 bumper has slots for these that they snap into, much like the top of the diffuser snaps into the bumper. I suppose you could drill or cut your bumper, but I opted to cut the tabs off the diffuser. I just used a sharp utility razor to cut the tabs off. Then used a disposible fingernail file to file the cuts nice and flush with the finished edge. Then I took some 1/4 wide 2-sided black 3M automotive tape and applied it to this edge. Cut the tape an inch or so long, then cut the tape part off so you leave a small tail of the backing left. When you get the wrap around linened up and attached to the splash guards and suff. You can pull that tail and pull the backing off of the tape while it's pressed against the bumper. Before you start to mount the bumper, you will notice you have to small odd shaped brackets. I dont have a picture of these right now. But with a little messing around you can find out that they have two screw holes that line up with two screw holes on the bottom side of the wrap around. Mount the backets so that the "sticking up" part of the bracket would line up with the splash guard once the diffuser is in place. Its hard for me to describe without having pictures. But once you are looking at the parts and pieces, you will see what I am talking about. Here is a picture that shows when the tabs you will need to cut are roughly located.



4. Mount the new diffuser.
In the same manner you removed the old one, only reverse, insert the tabs on the top of the new diffuser into the matching slots on the bumper. These should line up just fine. Use the heal of your hand to give good pressure to make sure you get them snapped in all the way.



You will now notice that those brackets you mounted to the bottom inside of the wrap arounds will line up and bolt to the splash guard you mounted earlier. Get the wrap around in place and run the little bolts into the matching holes in the splash shield. Once you do it on both sides, you can now put the screws back into the Mud shield/splash guard. Now, get the wrap around propperly matched up to the contour of the rear fender and use the tail you left on the tape backing to remove the backing on the 3m tape as you press it onto the fender. It is always best to make sure the surface you are taping to is nice and clean. Do that on both sides. You are almost done!

Now you need to replace the screws that attach the bottom part of the diffuser to the absorber. Only a few of the origional bolts fit. There are 2 the holes line up, but no way to get the origional bolts to "bite" on to anything. And two more holes in the center part that doesnt match up at all. I BELIEVE if you use the NEW diffuser, these holes will mach up ok. INSTEAD. I got some (four) 10/24 screws, 3/4 inch long, 8 small 1/4 washers, 4 1/4 lock washers, and four 10/24 nuts. Make sure you get a kind that wont rust. In the two holes that line up, just run the bolt with washers on each side, lock washer on the back and bolt it down tight. The two that dont line up. Drill a 1/4 hole in the absorber (using the existing hole in the diffuser as a guide) and then run a bolt setup through it.

TADDA!!!!!!! your ZL1 diffuser is DONE. If you chose to do the quad tips, as I did, you will need to cut off the old tips on your existing set up and weld on the quads, or you can get an exhaust kit that has quad tips.

If you do it the way I did it. You dont do any non-reversable modification to your car. Even though the write up is long. It really only took me a few hours to do, with help, and I had zero instructions on what I was doing. So hopefully, with this info, you can have it done quickly and painlessly. Enjoy your new BADASS look!



A few tips:

Use the funky green mat the difusser is shipped in as a pad to lay on while you work on the diffuser.

Spending a little extra time to file the edges smooth and straight will give a nicer, cleaner looking finished product.

Using the 3M body tape isn't neccesary, but in my opinion a good thing to do. It helps hold that edge to the fender, keeping there from being gaps for stuff to get into, the piece chafing the paint, and gives a cleaner look. Since the tape is black, it is nearly invisible.

You may find that your exhaust tips will not likely be centered in the cut out of the ZL1 diffuser. The ones on my Solos were to the far outside of the cut out and pressing pretty hard into the heat shield on the top. When the exhaust shop put the quads on, the guy had to make a small offset piece to get the new tips centered in the cutout.

I am sorry i didnt get a chance to go out and get more pictures for this write up and i didnt think to take some while I did it. I will try to get a few more pictures soon to "fill in the blanks".

If you get stuck or still have issues/questions after reading this and fiddling around, feel free to ask. I am happy to help when I get a chance!
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If you'd rather drive a civic that eats your soul than a camaro that eats your wallet then thats your choice.
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Old 05-20-2012, 01:34 AM   #2
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thanks T. this is very helpful. looking forward to the additional pics.

great looking car.
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Old 05-20-2012, 01:39 AM   #3
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That's awesome. Thanks for the write up, man.
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Old 05-20-2012, 09:35 AM   #4
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Very nice. Who's tailpipes are you using?
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Old 05-20-2012, 11:10 AM   #5
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good write up man thx for your help before too.
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Old 05-20-2012, 03:30 PM   #6
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Hes using the Solo pipes too. LOL if you read the first part of his write up he said he has the Solo exhaust and bought the tail pipes from Steve LOL. They have a huge selection of quad pipes on their website.
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Old 05-24-2012, 07:30 PM   #7
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The other day I noticed a thread similar to this one. I didnt notice it because it is titled something about the ZL1 rear bumper rather than diffuser. They have a lot of pictures that I wasnt able to get yet and some good information about a different method of installing it.

Instead of cutting off the tabs on the diffuser, they are cutting holes in the actual bumper facia. I dont know if it will make a difference in the end product or not. Bit I didnt want to permanatly modify my bumper in case I wanted to change it some day.

Check our their thread here!

http://camaro5.com/forums/showthread.php?t=190372
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If you'd rather drive a civic that eats your soul than a camaro that eats your wallet then thats your choice.
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Old 07-04-2012, 01:17 PM   #8
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i wish you can just buy the diffuser and call it a day. because i just looked up all the parts and prices. comes up to almost $600. glad i just cut my diffuser to make it fit the quad diffuser. GOOD WRITE UP THOUGH
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Old 07-05-2012, 11:04 PM   #9
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That looks really good!
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Old 07-09-2012, 07:58 AM   #10
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Good job on the swap and the write up. Can you do this swap with the stock tip in place or do you have to change tips before you install the new diffuser?
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Old 07-09-2012, 08:32 AM   #11
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Good job on the swap and the write up. Can you do this swap with the stock tip in place or do you have to change tips before you install the new diffuser?
You can run the stock tip but it will look bad.
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Old 07-09-2012, 08:52 PM   #12
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That looks really good!
Thanks man!

Quote:
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Good job on the swap and the write up. Can you do this swap with the stock tip in place or do you have to change tips before you install the new diffuser?
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You can run the stock tip but it will look bad.
Yup, that is correct. When I changed the diffuser out, I had the 4 inchers the Solo kit comes with. It "fit" but the tips were not centered, they were high (pressing against the heat sheilds) and outside (pressing against the heat shields). I imagine you would encounter a similar issue with the stock ones. Plus i think the stock "trash can" mufflers would really be visible in the wider openings. I dont think it would look that good. You could rock just the splash guards I suppose, i think i saw someone here who did it and it looked good.
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If you'd rather drive a civic that eats your soul than a camaro that eats your wallet then thats your choice.
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Old 07-15-2012, 09:25 AM   #13
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What size tips did you put on
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Old 07-16-2012, 06:26 PM   #14
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I think they are three inch.
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If you'd rather drive a civic that eats your soul than a camaro that eats your wallet then thats your choice.
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Old 08-18-2012, 10:22 AM   #15
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okay im going to add some details and what i did on my zl1 diffuser! I took the bumper off. Its not a hard job just a little scary. Its held on my 8 screws, 2 wire harnesses and some clips.(http://www.camaro5.com/forums/showthread.php?t=211889). http://www.camaro5.com/forums/showth...bumper+removal I didnt jack up the car. You can also take the diffuser off with the bumper still on but i felt i was going to put a dent in my bumper. (http://www.camaro5.com/forums/showthread.php?t=153221)

Okay some pics:
1st pic- the 2 red circles are the 2 hardest tabs to get off.
2nd pic. Shows the 2 hardest tabs again and the tab you have to start with. I had a problem getting the first tab off. Theres a clip in the bumper that holds the absorber that i had a hard time uncliping. Take your time and you can get it off.
3rd pic - in red shows the clip thats holding the absorber. In the green circle behind the absorber is a tab for the diffuser. Once you pop that tab in the diffuser just use your hands to pull up and the tabs will pop out until you get to the tabs in the 1st and 2nd pic.
4th and 5th pic- Shows the underside of the two tabs that i circled in the first pic. I used a flat head screw driver.just need to mess around with them. The two tabs in the center between the 2 circled tab holes are easy to get off. i just pulled up and they poped off. Then i got to the 2nd hard tab and used the screw driver. After that i used my hand and the rest of the diffuser just poped right off.

i didnt get the heat shields. i ran 3.5in dual staggered tips. I have mrt 2.0 and got the 2.5inch inlets but when i was at the exhaust shop its more like 2.75 so he had his work cut out for him. He had to cut my exhaust in 2 places and then cut the hangers off and reweld them on. Jerry (IDEALG) Sponsor on here did a great job getting the tips on.

The 2nd to last pic is what i used to get the screws from the rear wheel well off. the top screw i just used a t15 with a screw driver. and the bottom 2 i used a 1/4 inch wrench with a addapter and the t15 torx. worked great didnt have the take the wheel off.

The last pic is how it look with the single tip
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Old 08-18-2012, 11:02 AM   #16
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okay i have more to add. since i didnt get the new absorber. i had the extra 4 brackets laying around 1st pic. i decided to put 2 of them to use. I used the stainless steel screws Infinite T used to attached the diffuser to the absorber. But from a distance you could see the shinny screws under my car. I guess im picky but i didnt want to see them. Pic 2.(Circled in red is the stainless steel screw, circles in green is the black screw with the bracket) I took the bracket with one of the original black screws i took out of the diffuser and connected the absorber and the diffuser that way. Now theres black screws instead of shinny stainless steel screws.just a personal preference. If there good enought when gm put them on the car minus well reuse them!

** I would also get (2) #8 x 3/4"(<-i had this size laying around from my door panels, but they arent stainless steel) or (2) #8 x 1/2" stainless steel screw and nuts to connect the splash guard to the diffuser. Ill post a pic when my phone decides to send it**
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Old 08-18-2012, 01:06 PM   #17
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Great job on the DIY! That's help a lot!!!
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Old 08-19-2012, 08:12 AM   #18
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** I would also get (2) #8 x 3/4"(<-i had this size laying around from my door panels, but they arent stainless steel) or (2) #8 x 1/2" stainless steel screw and nuts to connect the splash guard to the diffuser. Ill post a pic when my phone decides to send it**


if any1 has any question just pm me
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Old 08-19-2012, 08:41 AM   #19
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looks good.
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Old 08-19-2012, 09:00 AM   #20
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so i was asked how the exhaust was centered...

i have an axle back so he cut a couple inches off the back on the axle back to center the exhaust. This threw off the position of the hangers. so he cut the hangers off and the cut my old tips off. he tack welded the axle back in place then tack welded the new tips. and then rewelded the hangers so they would fit. then fully welded everything so it didnt move. Idk whats it going to be like with a catback.
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Old 08-19-2012, 08:27 PM   #21
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so i was asked how the exhaust was centered...

i have an axle back so he cut a couple inches off the back on the axle back to center the exhaust. This threw off the position of the hangers. so he cut the hangers off and the cut my old tips off. he tack welded the axle back in place then tack welded the new tips. and then rewelded the hangers so they would fit. then fully welded everything so it didnt move. Idk whats it going to be like with a catback.
This is what i need now... Just a little add on the diffuser, like 2010camarolt said before is easier take the facia off and taking the absorber off make a piece of cake take the diffuser...
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Old 08-20-2012, 09:38 AM   #22
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Originally Posted by 2010camarolt View Post
so i was asked how the exhaust was centered...

i have an axle back so he cut a couple inches off the back on the axle back to center the exhaust. This threw off the position of the hangers. so he cut the hangers off and the cut my old tips off. he tack welded the axle back in place then tack welded the new tips. and then rewelded the hangers so they would fit. then fully welded everything so it didnt move. Idk whats it going to be like with a catback.
Same thing for a catback. Had mine done Friday. And for the absorber, luckily I had 4 thick plastic bolts and washers that I used. Idk where I got them but they were in my shop and they look factory. Just had to drill the two center holes on the absorber with a 1/4" drill bit so the diffuser would line up
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Old 08-21-2012, 02:30 PM   #23
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Same thing for a catback. Had mine done Friday. And for the absorber, luckily I had 4 thick plastic bolts and washers that I used. Idk where I got them but they were in my shop and they look factory. Just had to drill the two center holes on the absorber with a 1/4" drill bit so the diffuser would line up
Yup, that was what I was trying to describe in my original write up. To the guy that was talking about the shiny screws being visible, I actually changed mine out for the same reason. I was looking at it one day and decided to get black ones. I went to a place a few miles from my house called Tacoma screw (this place is a HUGE local manufacturer of all things screw related) and got some black coated screws to use. It does look better.

Thanks for posting up more pictures and info for those replacing the absorber and stuff. I was lazy and didn't swap it.

The trickiest party of this mod seems to be the exhaust, but it sounds/looks like shops are being able to modify peoples different kits without too much trouble.

This is still one of my favorite cosmetic mods so far, I still get tons of comments on it at shows and around town from other owners who know it is not stock.

Keep the info and pics coming guys!
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Old 08-29-2012, 11:12 PM   #24
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So does the side pieces stay on ok with the 3M tape?
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Old 08-31-2012, 07:42 PM   #25
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Do you know the part number for the diffuser?
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