avado Posted April 18 Share Posted April 18 Hey Guys, I need help from an exhaust systems expert 🙂 I'm fighting with an annoying hiss noise on 2500--3000 rpm. First I noticed it after I installed HFCs. Last year, I moved from HFCs to custom resonated test pipes and in addition, I installed performance headers and an ARK cat-back exhaust system. The sound is amazing except for the hissing noise. 2005, engine DE.   Quote Link to comment Share on other sites More sharing options...
HEADPHONES Posted May 1 Share Posted May 1 Could it be after exhaust work it has been nudged a little lower and now touches the W Brace when revved? If so maybe a little adjustment or some washers to space the W Brace a bit lower may help. Quote Link to comment Share on other sites More sharing options...
RobPhoboS Posted May 5 Share Posted May 5 What Y-pipe?  Quote Link to comment Share on other sites More sharing options...
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