Kooks 1 7/8" installed, now have more questions

[Pro Stock John]

I've had a bunch of different exhaust combos on my car.

Catless makes it a lot louder, just amplifies, and it gets even louder with an x pipe, and then a cam.

I would put cats on it OR stock mufflers. Or in my case I added a set of Hooker Maxflow mufflers. I think my H/C, catless combo is pretty quiet compared to others:


I had Kooks longtubes, their cats, stock H, and Moroso Spiral flow muffers. Then I took off cats and then x pipe. OMG at WOT sounded like a race car but even part throttle it sounded super loud. And a bit raunchy.

[Orange 2010 Camaro]

Originally Posted by Gonzo.ss

Did not think of using youtube

Before http://youtu.be/ljGABBz2Z80

After http://youtu.be/yvhE9o72Au0

What do you guys think ?

Did you have the car tuned after the install, & if so was it expensive?

Thanks for the help.

Orange 2010 Camaro

[Gonzo.ss]

getting it tuned tomorrow in the AM. Shop is charging $250 for a street tune

[Gonzo.ss]

Cant wait to get it done. I am hoping to feel a big difference after the tune

[ST1LE]

Originally Posted by GMTool

Well I can't imagine a magnaflow resonated x pipe is going to do much good on quieting it down on account that you still have the stock resonator. If it were me in your place I think I would get high flow cats, and put the stock mufflers back on. And get a tune as soon as you can. An L99 with headers and no tune has got to be very annoying with AFM. With a good tune you will definitely feel the increase in power especially the way the tranny will shift.

Actually from what I have seen and read from experiences the Res X Pipe is better at quieting things down than the stock Res.

The stock res is completely hollow inside, its just a can with a pipe in and a pipe out. The Res X has baffling etc to help cut down volume.

I agree maybe he should let himself get used to it for a while, then make his decision.

Also when he takes it for tuning he can hear the car from outside, and get a better sense of what others hear. HAHA...I will add that this didn't help for me, as all I realized is how deafening my car is with the NPP flaps open.

[Pro Stock John]

@ OP, I picked up 55RWHP from bolt-ons and 6mph at the track.

[newagemuscle]

Originally Posted by Gonzo.ss

I finally had my headers installed catless.

Along with my other mods, it is freakin loud. I've had them on for 2 days and out of courtesy to my neighbors ( I go to the gym at 5am) I need to quiet it down a little bit.

I want to add the video but am having trouble uploading it (any suggestions)

Would adding cats back to the mix lower the sound a little bit ?

Also my butt dyno does not feel a drastic difference in power. I am having it tuned tomorrow, will that make the power more noticeable.

My car is an LS3. I pretty much have the same mods as you other than the ported T-body. I have hi-flow though. I am in the opposite situation as you. I will be going to off road pipes and selling the hi-flow cats because I am boosting my blower. I also have the SLP LM2 axle back. Anyways... I noticed a big difference going with the headers. I dynoed at 381 before the install and 412 after Stock I made 370 to the wheels. With the cats my car is not really to loud at idle. It really comes to life when I am at WOT. With your same basic mods my car ran a best of 12.52 with a best trap speed of 115.12. I was on the stock tires and the track was not prepped. Had I got the 60ft down I believe with the mph I would have been close to a low 12 ET. I know your an L99, but this is just to give you an idea where I stand. Here are a couple vids for reference. Enjoy

[newagemuscle]

Originally Posted by Pro Stock John

@ OP, I picked up 55RWHP from bolt-ons and 6mph at the track.

Just looking at your sig. You really have that thing running great for a NA car... good job.

[45thCAMARO 2SS/RS]

To the OP, if u wanna make a deal, I'm looking to make my car louder lol so I have Kooks HI flow Cats, I want kooks off road pipe. If u wanna a deal to where we kinda trade in a sense that I sell you my cats and I can buy mine kooks OR pipe? They have about 8-10k miles thru them.

[Gonzo.ss]

Thanks for everyone's input. I'm gonna leave it as is for now. I got to open it up tonight and a wot it is loud. I just hope the tune makes a noticeable difference in the power felt. I'll post tomorrow and let everyone know.

[newagemuscle]

Originally Posted by 45thCAMARO 2SS/RS

To the OP, if u wanna make a deal, I'm looking to make my car louder lol so I have Kooks HI flow Cats, I want kooks off road pipe. If u wanna a deal to where we kinda trade in a sense that I sell you my cats and I can buy mine kooks OR pipe? They have about 8-10k miles thru them.

Have you though about gutting them? I'm in the same boat as you, but not for making it louder. I just don't want to melt them if I boost my car.

[Ludasmith]

You should notice the gain above 60 MPH for sure. My G8 used to pull hard from 60-120 with my ARH headers.

[45thCAMARO 2SS/RS]

Originally Posted by newagemuscle

Have you though about gutting them? I'm in the same boat as you, but not for making it louder. I just don't want to melt them if I boost my car.

Thought about it but idk if I really want too if I don't have too, I'd prefer maybe swapping someone or selling this to someone, so I can have the legit off road pipe but if no one wants too then I might.... What do you have to do to gut them?

[newagemuscle]

Originally Posted by 45thCAMARO 2SS/RS

Thought about it but idk if I really want too if I don't have too, I'd prefer maybe swapping someone or selling this to someone, so I can have the legit off road pipe but if no one wants too then I might.... What do you have to do to gut them?

If your Kooks cats are in good shape you should be able to sell the for just about what the off road pipes from Kooks cost. I found the for $200 shipped. I would think we could get just about that much for our hi-flow cats considering what they go for new. As for gutting them. This was something we would do back in the day on our old 5.0 Mustangs. We would drop the H-pipe and punch the cats out with a long metal rod. They will break out and leave you with a home made off road pipe. That is not the route I am going, but it can be done and there are many members on here that have done that.