Adam.c6

I have read many threads with many many OPINIONS on weather modding exhaust will void drivetrain warranty on a c6 I know headers will, but my 2013 comes with 4 cats, if I were to remove the two on the x pipe that DONT have O2 censors will I be voiding warranty And why? Please share FACTS.

Thanks in advance

-Adam

John Harry

I understand what you're trying to get at, but the fact is there is no definite answer to this. If you have a powertrain problem a dealer may or may not notice the two missing cats, and may or may not decide to deny warranty service based on it. At that point you might be successful in arguing that your mod could not have been the cause of the problem. Your case would be weakened by the fact that it is federally illegal to remove cats or even to replace a working cat with another. Having said all that. personally I wouldn't worry about it.

Adam.c6

Okay that's a fair point you've made, I believe the 05-08 models only have two cats instead of four, so I guess it must be something Gm is doing for future emissions laws, and I know it's illegal to run cat-less. But if I still have the two primary cats and remove the second set am I considered Breaking the law still? In regards to the previous models only having two. Also I appreciate the info and input. I just got the car for a stunning deal with a stunning warranty and don't want to jeopardize it.

Guard Dad

Don't try to tippy-toe around the issue, the four cats are required and thinking it's ok to remove the second two cats because the older version of you car only has two is only kidding yourself.

Will you get caught? Not a clue. Will it void some portion the GM warranty? Could be.

The question is what do you hope to gain by removing them? The four cat engines carry the same rating as the two cat engines.

Zilla

I asked my dealer the same question and they said a modification to the drive train will not void the warranty unless the modification is the direct cause of the problem. Then it is up to GM to prove the modification caused the problem. What about dealers that do modifications to car before selling it?

This issue was discussed a lot in the C5 forum.

Adam.c6

Guard dad the point is to not have my vette sound like a Prius with an ls3.. What do I hope to "gain"? Probably not much but if I where to add a cat-less X pipe I would be removing them ..and that was my main concern.

Adam.c6

There we go, perfect. Thank you that makes the most sense and yes I have read some threads on it but everyone has an opinion based on their assumptions and never found a straight answer but Now I'm informed. Appreciate it

-Adam

Guard Dad

Why didn't you say this is about getting the right sound in the first place!?!

Do you have the NPP Dual Mode Exhaust on the car?

Have you looked into the numerous axle back aftermarket muffler systems?

You should be able to get the sound that you are after without creating warranty or emissions issues by altering the emissions system.

Z27LS3

warranty void is extremely unlikely unless there is a branded title, warranty repair denied is much more possible. the only time a warranty repair should be denied is when the problem is a consequence or related directly to the modification and can be proven to have been caused by the "non-GM parts". its a huge grey area and
the dealers simply "don't want to help" or "are worried the repairs that they warranty will not be reimbursed back by GM". dealers who get involved in bogus warranty repairs can be charged back or worse, audited.

if you have legit warranty problems I see no reason why the dealer would not take care of them. I would ask to work directly with the service manager if needed and if he (Or she) is no help you can always call GM and report the dealer and ask for help.

not08crmanymore

If you want to know the correct answer to your question by the only opinion that really matters...you should ask CHEVY CUSTOMER SERVICE or WARRANTY SERVICE at their headquarters. Or..read your owners manual under WARRANTY...

Adam.c6

I don't have the dual mode no and I hear even with the axle back systems it won't give a much louder sound because of the second set of cats, and matter of fact I would like to muffler delet and go straight piped (with 2 cats )

Adam.c6

Solid and great info thanks for the feed back

Adam.c6

Very true and i will be doing that thank you

Dano523

If you remove any of the cats, your going to void the warranty.

The cats are back pressure on the system, which the car is OEM tuned for that amount of back pressure to adhere to that year smog standards, which in turn is used in conjunction with the TM for the amount of power that the back tires/drive line can receive at any given time.


So if you pull any of the cats, and say have a torque tube problem, they are going to blame it on the cat removed, which allowed the motor make more power, and which in turn caused the torque tube (or any other drive line) problem in the first place.

Adam.c6

Well said, and considering that what if just muffler delete, would it be loud? I had a c5 no mufflers it was loud at wot but it only had 2 cats, how much difference do the extra 2 cats make in sound ?

wayback

After removing the cats you will need a tune. GM now requires dealers to scan for tunes. Voiding warranties if they find a tune, or that there ever was a tune.

Best bet is to establish a relationship with a dealer that is mod friendly. As long as the problem is not caused by the mod they will fix it under warranty. They want the business.

You probably will be self insured for the power train.

Don-Vette

Why not run hi flo cats with the axle back system of your choice?

Entaille

I am sure there are certain issues and price points that forces the dealership to fully disclose and communicate with GM, and they probably have check lists and things to watch out for before getting confirmation on a warranty repair.

2013 here also - my take on it is, you fiddle with it, you assume potential responsibility for it, so go into it with that mindset and anything that happens will be alright. if you don't feel good about that, don't mess with it, IMO. stick to an axle back if it makes you uncomfortable.

VET4LES

Removing the two rear cat's will defiantly void the warranty. The C6 was turned with them in place. In addition you will void the emissions warranty which is a federal offense.

Entaille

no tune required removing the 2 added cats. there are no sensors checking on them, and the car doesn't run too rich or lean without them. a tune would be optimal, but it's not required.