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  1. Mechanical and Technical
    I have a 03 zx6 with stock headers and yoshi slip on. Always ran 93, Ive fouled 2 sets of cr9e ngk plugs and now I have cr8e for one heat range hotter to try and help because it spits out black smoke like a diesel. I heard that just a slip on wont really affect much, would a power commander help...
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