SOURCE: 1100 Dragstar Fitting Straight Pipes
We have changed a few bikes from standard pipes to drag pipes. Their is a few considerations here, sea level or at what altitude, how much back pressure. so my suggestion rather take it before fitting the pipes to someone with a dyno, run and record the test, then have the pipes fitted, and let the same shop to the test again on there dyno, they will then know what to do with the jetting, because you should achieve better results with your new pipes.
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Thanks for all your help guys; in the end it was easy enough to find a pdf copy on the net
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