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'14 OBM Vagon 6mt
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Discussion Starter #1
Have been doing some reading, and found that SW headers with catted x-pipes will throw a CEL and therefore require a tune...is there any header/catted x pipe combo that'll work without a tune? Kooks? Would prefer to run headers with stock muffs if it can be done without affecting the warranty on my unmodified '14 Vagon. So tunes are not an option for the next 5 yrs...

Also, came across a decent deal on a Corsa sedan axle back with 4" tips...has anyone tried to fit this exhaust on a wagon? Realize the tips are 1/2" larger than their wagon exhaust, but have come across threads where ppl were able to fit SW & Borla exhausts with 4" tips on a wagon. Just never seen anyone do it with a Corsa.

Love having a quiet car for when I'm trying to be fairly inconspicuous, but would enjoy more audible feedback when canyon-carving. Too bad there isn't a dual-mode exhaust for our cars...
 

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Your warranty will only be affected if your dealer wants it to be. My dealer was fine with my mods.

Now, if there was an engine failure that was shown to be related to a bad tune, that could be an issue. But tuning today is pretty rock solid by reputable shops.

I didn't need to think twice about doing it on my new at the time '09...
 

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'14 OBM Vagon 6mt
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Discussion Starter #3
So I'll take that as there aren't any long tubes w/catted x-pipes that'll work w/o tune...damn

Bump on the sedan Corsa exhaust Q
 

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2009 CTS-V
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opposite locker said:
So I'll take that as there aren't any long tubes w/catted x-pipes that'll work w/o tune...damn Bump on the sedan Corsa exhaust Q
My experience only....there were no headers I've ever been involved with that were "plug and play". All of them required a tune to run right. Only difference was an off-road pipe setup needed to run a tune to shut down the O2 sensors that would cause a code and a light. My opinion is be prepared and willing to tune when you bolt them up. It's a well-choreographed dance that requires a solid foundation.
 

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'14 OBM Vagon 6mt
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Discussion Starter #5
Thanks...will stay stock for now or perhaps go with a Corsa when I can stomach $1200 for a pair of mufflers.
 

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'14 CTS V Wagon
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Not totally wanting to hijack your thread but has anyone used the SW catback setup? Does it require a tune?

From my research the Vagon has mufflers different than the sedan and certainly the coupe.

I'm in the same dilemma with my 14 Vagon. I want to turn it up but not lose warranty.
It has been suggested to me to find a "mod friendly" service department, keep your mods on the mild end and enjoy a solid platform.
Unfortunately where I live the dealership is just barely OK with a CAI and catback.
 

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2013 CTS-V wagon M6, 2011 GMC Sierra CCSB 6.2L, 2004 GTO
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Sometimes, it does not matter if your dealer is ok with mods.....some warranty claims have to be approved by GM before they will pay for it. So if your car has a problem, it can be flagged at that time for mods by the regional GM rep or whoever makes the decision and all future claims will be denied because of aftermarket parts installed on the car. Headers are pre O2 sensor, and can affect how the car drives - a GM rep will never approve work if headers are on there. Stay after cat/O2 sensor if you are worried about the warranty.
 

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2014 CTS Vsport Premium
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Sometimes, it does not matter if your dealer is ok with mods.....some warranty claims have to be approved by GM before they will pay for it. So if your car has a problem, it can be flagged at that time for mods by the regional GM rep or whoever makes the decision and all future claims will be denied because of aftermarket parts installed on the car. Headers are pre O2 sensor, and can affect how the car drives - a GM rep will never approve work if headers are on there. Stay after cat/O2 sensor if you are worried about the warranty.
Per the Moss Magnusson act, technically, they have to prove the modification caused the problem before denying the claim.

That said, they make it enough of a pain that most people just give up.
 

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2012 CTS-V Coupe
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My dealer said they were okay with anything that only has to do with..."In and out"...of the air in the engine. In other words, CAI and cat backs are fine, and that also went for headers. I asked specifically, as long as I don't tune it, they are fine with it.
Talked to my own tuner and he said they can prevent a CEL by subbing the O2 sensors, thus not tuning it. But there will also be next to nothing in the way of gaining HP from the headers until the car is tuned.
 

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2011 CTS-V A6 Sedan Modded :)
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I was told the kooks headers with the GREEN catted xpipe are not supposed to throw a code. I have kooks with their regular cats but I'm tuned so no cel :)
 

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Unfortunately I agree that without a tune you're simply changing your exhaust sound with headers. Shame because CAI, exhaust and tune can easily be worth another 30 to 35 rwhp. Also unfortunately, if anything happens to the car that is drivetrain related it's not unusual for GM to ask for your tune from the dealer. Anything unusual there and GM will void your powertrain warranty. This puts your dealer in a position where they will not be reimbursed for warranty work. So mod-friendly dealers are a myth the moment something major breaks, i.e. rear diff and yes even known faulty pieces like S/C's.
 
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