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  1. #1
    dnielsen's Avatar
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    Exaust Manifold Mods

    Whats the best exaust manifold mod? If we do the throttle body mod, head porting with the oversize valves, Rotax cam wouldn't it make since to open up the exaust manifold a bit? I havn't even looked at the mani but I'm sure someone has thought of this before and has done some sort of opening up the exaust. I know I could buy a water jacketed header but i'm sure there are other options. Pics would be nice!!!


  2. #2
    Eastside Powersports Slow 91's Avatar
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    i port matched my exhaust manifold to the head. i dont know if its every manifold, but mine had alot of casting flaws and imperfections.

  3. #3
    dnielsen's Avatar
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    I know some people are using the Rad-4 Torque Plate to aid in the exaust flow and are claiming 60-80rpm gains, this would indicate a significant improvement to the exaust flow in that area.

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