yeah does feel like a vacuum just wasn't sure where the pipe was! can't really listen for hissing as gotta k&n and straight through exhaust with a couple small blows and really annoying tapping noise from the manifold where the studds have pulled out! its not because the manifold blow though as tightened it best i could earlier and it stopped blowing for while bit made no difference! will have a look for wot u mentioned in a bit!
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