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FPenvy

no the CBE with any form of a TP, HFC, RHFC will be louder. the cats on a car are super restrictive for sound and flow.

and when I say quiet don't think of it as silent. that's not the case. the addition of a FI CBE and any form of oem cat deletion is a major sound upgrade and volume increase over stock.

also the size of the resonators pretty much only kills the rasp and doesn't hinder the actual exhaust volume that much. 12" vs 18" is just changing the amount of rasp and not really noticeable change in actual overall volume of the exhaust note itself.

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324whp/258wtq AAM Tuned |F.I. NonRes CF CBE/NonRes TestPipes #373|UpRev Tuner|Akuma Motorsports Intakes|Z1 34 Row Oil Cooler