dsracing Posted January 12, 2010 Report Share Posted January 12, 2010 I am racing my 07 zx10r this year and as I am reasonably poor I will be running the std exhaust system. My question is: Am I better off removing the exhaust valve or leaving alone My theory is remove and map fuelling to suit as I only need the top end of the engine. Thoughts?? Link to comment Share on other sites More sharing options...
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