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I agree with Deacon Blues. Def sounds like some kind of exhaust valves. I'm happy I went with non npp and have afm off so I don't have these issues.
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2022 Camaro LT1 A10 - Drag Pack/AxleBack -11.849@118.67MPH/1.798 60'
2001 Camaro SS A4 - HCI/Stall/Bolt-on/Gear/Tune/DR/Diet - 429HP/392TQ - 10.99@123.58MPH/1.584 60'
1998 Camaro Z28 A4 - Bolt-on
1999 Camaro Z28 A4 - Stock
FJB |