Um its the ARK exhausts X-pipe section causing the loud whistle/hiss noise. Trust me I switched my exhaust to HKS and kept the same Berk Test Pipes and the hiss/whistle dropped a lot!
Check out my journal it explaines it in more depth.
DAN
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-My BRZ with exhaust will decimate all if we overnight parts from Japan-
10 Civic EX Sedan- Current Daily
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