Stillen Gen3 Intake, Berk Hi-flow cat, and Stillen cat-back exhaust

BerkTech

The hiss that you guys hear as the revs drop in the 3-4K range is a well known sound when putting test pipes on any of the VQ motors. It applies to the 350Z/G35/G37. If any of you are previous Z/G owners then you are already familiar with the term "rasp". Test pipes will have the most pronounced hiss/rasp, HFC's with an aftermarket exhaust will have it as well if you know what to listen for. Resonated test pipes will help with reducing the rasp, but nothing short of the full OEM exhaust will completely eliminate it.

tru-asistik = if you've ruled out the gas cap, check the evap can lines in the rear of the car. They are on the passenger side right behind the exhaust tip. If you have a tiny leak there it will throw that P0456 code.

The hiss/whistle you hear from the intakes is the exact same thing as the test pipe hiss. Resonances also happen in reverse on the intake side.

RCZ's video of his Stillen CBE + HFC vid. You can hear it in there, not as prounouced as DannyGT's, but it's there. Thanks for posting the vids guys!
[youtubehq]6aIiNLfUnos[/youtubehq]

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