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Mid Pipe w/ Smaller Cats - Re-Tune Required?


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On my...2008 GT500 with JLT CAI, diablio tuner, 2.6" SC pulley, IW oversized crank pulley, FRPP TB twin 63.5mm, Corsa sport mufflers, aluminum driveshaft, & Dynojet dyno tuned @ 16# boost & 557 rwhp, 595 rwtorque.


If I replace stock mid-pipe & cats with smaller/reduced cats mid pipe (less back pressure)......


Will I need to have car re-tuned/dynoed to run properly, or will on board computer re-learn/adjust for reduced back pressure??

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