http://www.vfrdiscussion.com/forum/inde ... en/page-56
Design by yours truly, implementation by HighsideNZ aka Phil. Home brewed exhaust system & the numbers are from factory pro dyno, which always read low & the insert figures are Phil's extrapolation at +12% to show DJHP or thereabouts
I think he should have used 15%, still good number from a small overbore.Enjoy