Recent content by Randy JR.

  1. R

    300/440/550 quick exhaust backpressure question...

    i'm putting a full coffman's pipe on my mostly stock 550sx and i'm sure it's not going to build enough pack pressure. if i put a hose clamp to pinch the rubber exaust pipe some would it help build some? kind of in the theory of putting a bolt through straigt pipes on a motorcycle which works...
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