Wilbert350 Posted May 3, 2018 Share Posted May 3, 2018 I've just fitted resonated decats and heard a hissing noise seemingly just behind me while driving. Not all the time - only at certain levels of throttle. I've refitted new gaskets at the Y pipe join, but it's still doing it. Part of me wonders if the stress on the Y pipe while fitting and the condition of it (sorry looking flexis) might have caused it to start coming from the Y pipe. Does anyone have experience in this? Quote Link to comment Share on other sites More sharing options...
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