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I have straight pipes on my vintage,with a k&n air cleaner,no codes runs the same,no fuel controller or flash.i have also changed tire sizes at will with out codes . (Someone please take away my tire machine) the
 

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Discussion Starter · #3 ·
Thanks dochardtail, I can see u have a tire problem, the dealer said that pipe may cause bike to throw codes, with big bore kit,I’m guessing very little back pressure, thanks for your input,
 
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