05-16-2018, 08:42 PM | #1 |
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Cat-back / Tune Question
I have 100% stock 2016 SS M6. Looking to add a cat-back and seem to get conflicting info on weather or not a tune is required when adding a cat-back only. i will be keeping the stock headers and cats intact (for now).
Just don't want a check engine light or the car to run bad after bolting it up.
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05-16-2018, 08:48 PM | #2 |
Drives: 2016 Hyper Blue 2SS Join Date: Feb 2016
Location: Layton, UT
Posts: 498
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No a tune isn't needed. You can delete the secondary cats also without the need for a tune.
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05-16-2018, 09:04 PM | #3 |
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Thank You sir
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2016 Camaro 2SS - M6 | Hyper Blue Metallic | NPP | MRC | Sunroof | Navigation | Black Bow Ties | ACS Spoiler | Black Tail lights | ZL1 1LE 3rd Brake Light | Roto Fab CAI | Stainless Works Cat-Back | Black 1LE Wheels | Nitto NT555 G2's 285 Front 305 Rear
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05-16-2018, 09:43 PM | #4 |
Drives: 2018 2ss 1le Join Date: Jan 2018
Location: Huntington, NY
Posts: 479
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when they say the secondary cats are not monitored what's the deal...
i know you can buy kits and x pipes and such but its not going to throw a code? i heard removing them is like 15 hp alone is that true? |
05-18-2018, 08:00 AM | #5 |
Drives: 2019 ZL-1 Join Date: Feb 2009
Location: Troy, MI & Naples, FL
Posts: 2,019
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No hard data on picking up 15 hp on the secondry cats that I am aware of. It will sound more raspy....
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05-18-2018, 08:28 AM | #6 |
Drives: '17 Red Hot 2SS 6MT Join Date: Mar 2018
Location: Chicago Suburbs
Posts: 346
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There are no oxygen sensors after the secondary cats, so they are not monitored by the computer. They're just like a "bonus" to help save the environment, and because they probably couldn't make the primary cats large enough to meet emissions targets. They are also very handy for covering up any unwanted fuel smell if the primary cats are removed. ;-)
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05-18-2018, 08:40 AM | #7 |
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Drives: 2017 Camaro SS Join Date: Jan 2012
Location: Houston, TX.
Posts: 628
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Definitely do not need a tune just for a catback exhaust. While there may be slightly less restriction your cats are still doing most of the restricting on the flow and your O2 sensors aren't going to see any difference.
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05-18-2018, 01:58 PM | #8 |
Drives: 2018 Redline Edition 2SS Join Date: Dec 2014
Location: Mays Landing, NJ
Posts: 778
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There's no way you're picking up 15HP by removing the secondary cats...it's solely a sound modification, nothing performance.
As others have said just doing a catback will not require a tune at all...and nor does the secondary cat delete...I believe they're on there just for KKKalifornia emissions but GM said screw it and just had them on there for every car.
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05-18-2018, 02:53 PM | #9 |
Drives: 2018 2ss 1le Join Date: Jan 2018
Location: Huntington, NY
Posts: 479
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i see what i was was looking at was installing the test pipes that eliminate primary cats not secondary..
my mistake |
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