I have an Invidia Gemini CBE I first went with Invidia TP's I had a little rasp and loud hiss. Then switched to Invidia 200 cell HFC's due to state inspection and the rasp is gone but the hiss is there on a decel but nothing to crazy. the majority of the posts I read pretty much everyone has the hiss if they are running TP's or HFC's
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2013 Ford Mustang GT 5.0 6MT ROUSH intake | ROUSH axle back | ROUSH shift knob | ROUSH coil covers 2009 NISSAN 370Z SOLD
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