Check out my Journal thread I have pics and a write up and video,
Reason for rasp howl whistle noise is they designed the X pipe with stock cats so with Test pipes or HFC you are going to get this Due to the increased exhaust flow through it..and it really seems more amplified than other exhaust, switched to HKS and No trace at all.
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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