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  1. M

    equal length header

    Do any of you have the "Essential Speed" equal length header? http://tinyurl.com/2k8xq They make some pretty big claims. Also it keeps the first cat which I would think would keep a lot of the restriction. Does anyone know anything about it? I know all the 4-1 headers maninly just...
  2. M

    Header opinions?

    I've been looking into aftermarket headers for the P5. What I've come up with is the AWR, HP Racing, and the racingmazda. The Racing mazda header I believe eliminates both converters which I don't want. But is there really a difference between the AWR header and the HP Racing header besides...
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