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I just installed cutouts to my c6z and was looking at installing headers and x pipe for the performance benefits and sound. But since I had cutouts I wouldn’t want to spend any extra $$ on an aftermarket muffler and tips. But would this cause any issues and say in the future if I was going to get a tune would there being any issues with the amount of airflow changing when the cutouts are open and close? Thanks and sorry if I asked any dumb questions.
 

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Unless you are adding other power enhancers such as a cam and heads, etc., it wouldn't be worth the added expense. The stock exhaust manifolds flow really well.
 

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I just installed cutouts to my c6z and was looking at installing headers and x pipe for the performance benefits and sound. But since I had cutouts I wouldn’t want to spend any extra $$ on an aftermarket muffler and tips. But would this cause any issues and say in the future if I was going to get a tune would there being any issues with the amount of airflow changing when the cutouts are open and close? Thanks and sorry if I asked any dumb questions.
After I installed headers and x pipe on my C6 Z06, and removed the cats, I blew out two sets of factory mufflers. I spoke with a Corvette engineer about it, and he said the headers were the culprit. I'm now running Corsa mufflers, like them, and get a lot of compliments on the car's exhaust note.
 

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As mentioned the stock exhaust manifolds for your Z06 are a good design and not losing performance
Handle the higher output of ZR1 so do not waste your money nor effect smog tests or rules
 

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I have Katech Stage 2 (heads, cam, intake, tune, etc) with all original stock headers, exhaust, x pipe (2011), and stock mufflers. 540 rwhp. Sounds and performs great.
 

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I'll disagree. A quality set of headers (Kooks or American Racing) with high flow cats and X pipe work well with the factory mufflers. If you can find a set of ZR1 factory mufflers they are slightly better.
I will agree that you can run a modified motor through the factory exhaust manifolds and mufflers, but you are giving up some power at the higher rpm range. The only reason to do this is because you live in an area that requires inspection and will not allow headers.
 

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I'll disagree. A quality set of headers (Kooks or American Racing) with high flow cats and X pipe work well with the factory mufflers. If you can find a set of ZR1 factory mufflers they are slightly better.
I will agree that you can run a modified motor through the factory exhaust manifolds and mufflers, but you are giving up some power at the higher rpm range. The only reason to do this is because you live in an area that requires inspection and will not allow headers.
I agree with Vito. Headers/mid pipe are worth solid gains and they change the sound that sound immensely better than OEM (sound is of course subjective to the listener). I picked up 20 rw (dyno proven) when switching from OEM to Kooks 1 7/8ths and catted mid-pipe.
 

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Nothing is proven when using a chassis dyno (worse non load bearing type) to claim gains, simple sneak job of changing the weather factors will bias the results
In most cases when headers are installed and O2 sensors are moved downstream then a tune of PCM is required and any gains are from that and not changing a mid pipe and/or CATback which does nothing for gains
Most cases people select the wrong size of primaries and kill off low to mid range torque
Most are installing a good X-pipe design in the wrong placement do not gain much in using the exhaust pulses to extract exhaust in cylinders

Fact is using stock Z06/ZR1 OEM exhaust and a good custom tune will have the best gains.
 

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But isn't that the point of dyno's AND tuning? You can't say in ALL cases that ALL dyno's are a non-proving metric. I use the same dyno year round and make a round of mods and then shoot for a day with similar weather from the time previous to eliminate that as a factor. I had verifiable gains on a dyno when making my mods. And since I'm not a track guy...I don't care about ET and trap speeds...so for me, a dyno is the only measure of performance there ever will be.🤙
 
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