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2022 K5 GT Line AWD
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Leave the Cat and resonator. Then 2.25 straight pipe all the way back. Some nice pops and crackles and some nice burbles on cold start. I love it on mine. Also since I left the cat and resonator and same size piping it doesn't throw any codes.
 

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I did stainless steel double wall midpipe with 2 flowmaster 71415's with 2.50" pipe after the Y, with 3" oval staggered chrome tips. Added a high flow cat as I would get a low backpressure CEL, it also made it more quiet as I thought it was a little too raspy as it was for daily driving. Miniscule drone and sounds amazing, real mellow. Added aluminum plates around the vents to frame the tips so there is no gap, kind of like a stinger.
 
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