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Camaro V6 LLT Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 07-06-2012, 11:38 PM   #1
camaro_25
 
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REAR CATS DELETE- HELP!

I have seen on here where members are deleting the back two or front cats but not all four. Has anyone done this? will it still pass emissions without all 4?

HELP/ADVICE IS NEEDED!!!
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Old 07-07-2012, 03:09 AM   #2
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If your in a state with strict emissions tests no it won't pass. It's against federal law to modify your cats.

Now having said that, I'm getting it done probably next week.
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Old 07-07-2012, 03:58 AM   #3
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federal law? really. theres no emissions in florida tho so im doing it. lol
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Old 07-07-2012, 07:19 AM   #4
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federal law? really. theres no emissions in florida tho so im doing it. lol
Yes, FEDERAL... while you may not have emissions testing in Florida, the cats are still covered by Federal emissions law... It is illegal to "tamper" with them...

quick search:

http://www.google.com/url?sa=t&rct=j...AwJ6Io6aL0pluA
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Old 07-07-2012, 09:34 AM   #5
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Well then wouldnt that make high flow cats that come on lt headers illegal too?
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Old 07-07-2012, 09:48 AM   #6
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my cats are deleted and im in florida. i did not delete the ones by the O2 sensors so i only deleted 2 of them and i didnt want to take the chance of a CEL. It SOUNDS GREAT too!
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Old 07-07-2012, 09:58 AM   #7
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Well then wouldnt that make high flow cats that come on lt headers illegal too?
Yep... pretty much... it's illegal to remove a working cat...even it you replace it with a HFC...
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Old 07-07-2012, 10:11 AM   #8
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man that stinks.... But its good that I know a guy that will pass it. So as for sound... does it make it raspier or does it make it deeper and smoother?
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Old 07-07-2012, 10:17 AM   #9
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man that stinks.... But its good that I know a guy that will pass it. So as for sound... does it make it raspier or does it make it deeper and smoother?
I found it did add some rasp when you where hard on the gas pedal and you hit about 3000 RPM... but cold start up and idle sounded soooo good it was worth a bit of extra rasp... LOL
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Old 07-07-2012, 11:09 AM   #10
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I found it did add some rasp when you where hard on the gas pedal and you hit about 3000 RPM... but cold start up and idle sounded soooo good it was worth a bit of extra rasp... LOL
Haha cool! I don't do a lot of hard driving. I hardly ever get her up past 3000 rpms. I baby her a lot haha. So that being said, do you think that this would be a good mod for me?
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Old 07-07-2012, 11:18 AM   #11
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Haha cool! I don't do a lot of hard driving. I hardly ever get her up past 3000 rpms. I baby her a lot haha. So that being said, do you think that this would be a good mod for me?
If you like loud, sure!

JBA shorties, rear cat delete, resonator delete and MRT Ver 2.0

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Old 07-07-2012, 11:42 AM   #12
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Yes sir that sounds good! So believe it or not you are actually who I found my exhaust (mrt 1.0) from. I saw your build in a magazine. I also saw you rims boss 338s, correct? I've thought about gettin 20s in chrome for that retro look. What do you think?


Btw- hope that didn't sound like a creep, I'm actually thankin you. If you wouldn't have all the right ups about your car I wouldn't have my exhaust.
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Old 07-07-2012, 11:52 AM   #13
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Yes sir that sounds good! So believe it or not you are actually who I found my exhaust (mrt 1.0) from. I saw your build in a magazine. I also saw you rims boss 338s, correct? I've thought about gettin 20s in chrome for that retro look. What do you think?


Btw- hope that didn't sound like a creep, I'm actually thankin you. If you wouldn't have all the right ups about your car I wouldn't have my exhaust.
Yep, Boss 338... I really liked them... if the Chrome works for your car, go for it! (if you can still find them)

And you don't and you are welcome!
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Old 07-07-2012, 12:42 PM   #14
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ughh no chome....but whatever work for ya

Is a little hard to get this DI engine LOUD without some type of negative sound frequency creeping in. From my experience, going catless with 1 3/4 long tube header and solo CBE definitely made my car sound something like a V8 jet engine hybrid LOL. It was too loud for my taste so I had to take it off and sell quickly. When you start going for loud, you are going to also get some drone and rasp. This is when you have to either use helmholtz principal which solo exhaust basically is(almost a no muffler CBE with helmholtz pipes), or use resonated x-pipe. I personally like resonated x, but it will quiet down your overall noise level, but it will definitely remove all drone and rasp. Long tube/no cats/SOLO, can't go wrong if you want LOUD without the other unwanted frequency

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Old 07-07-2012, 01:10 PM   #15
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ughh no chome....but whatever work for ya

Is a little hard to get this DI engine LOUD without some type of negative sound frequency creeping in. From my experience, going catless with 1 3/4 long tube header and solo CBE definitely made my car sound something like a V8 jet engine hybrid LOL. It was too loud for my taste so I had to take it off and sell quickly. When you start going for loud, you are going to also get some drone and rasp. This is when you have to either use helmholtz principal which solo exhaust basically is(almost a no muffler CBE with helmholtz pipes), or use resonated x-pipe. I personally like resonated x, but it will quiet down your overall noise level, but it will definitely remove all drone and rasp. Long tube/no cats/SOLO, can't go wrong if you want LOUD without the other unwanted frequency

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That was some great info! Thanks a lot! But when I say chrome I don't mean "dub" style. I was just thinkin it would be cool for a retro look. I'm lookin for a five spoke Kindve carrying that theme. I just personally don't like the black on black look. What do you think? Any ideas? Thanks-
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Old 07-07-2012, 01:17 PM   #16
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so you didnt touch the front cats huh? i was told with getting retuned, i could turn off the engine light so i think im going to go for it.
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Old 07-07-2012, 01:19 PM   #17
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so you didnt touch the front cats huh? i was told with getting retuned, i could turn off the engine light so i think im going to go for it.
Well I haven't done anything yet. I was hopin that only removing the rear cats wouldn't make any CEL come on...
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Old 07-07-2012, 01:27 PM   #18
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it wont, i have already deleted my rear cats. sounds good too. do you have yours tuned yet?
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Old 07-07-2012, 01:36 PM   #19
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it wont, i have already deleted my rear cats. sounds good too. do you have yours tuned yet?
No not yet. The only thing I have done is MRT 1.0 exhaust.
I'm thinkin next Im goin to delete the resonator and then take off the back set of cats. I'm just tryin to see if I will still pass emissions in NC.
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Old 07-07-2012, 01:57 PM   #20
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Are you guys just putting a piece of straight pipe in place of the rear cats when they're cut out?
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Old 07-07-2012, 02:02 PM   #21
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that would make sense to me? I dont really have a clue how the whole process is done. Thats why i posted about it. Apperantly, if you remove the back two it gives a much deeper, better sound and doesnt cuase any CELs
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Old 07-07-2012, 02:08 PM   #22
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Yes, just a straight pipe where the second cat is supposed to go. Yes it does make it louder but it also introduces a bit of rasp.

The emissions questions can probably better be answered by someone who lives in your state and is better aware of the emissions laws there.

And finally, no it won't cause a CEL. So no need to tune.
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Old 07-07-2012, 02:11 PM   #23
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Thanks for the sum up!
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Old 07-07-2012, 03:27 PM   #24
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Rear cats coming off Monday morning, I cant wait!! Simply four cuts with angle grinder, two 2.5" pipes about 5" long and four weld spots to make.



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Old 07-07-2012, 03:49 PM   #25
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you dont need a tune for it unless your doing front cats, but i was asking if you were already tuned. if so the front cat delete would be no problem. u can get it retuned to turn off light.
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