You can make some really cheap mods to the SX/SXR 700's to make them work better in drags, if that is your only concern, drop a tooth or two on the jackshaft, do the head gasket mod, bore the silencer, see tech pages. You will also want to let the front snubber strap out a position or two, install a smaller spacer on the top or your transfer rods. If you want to continues to throw money at her, install reed spacers, and a boost bottle. I have a old 97 with spacers, shaved head, because it warped, boost bottle, bored silencer, and a HeelX roller secondary, one tooth smaller on the jackshaft, and I have beaten both Vipers I went up against, but had trouble with both 800 cats and F7's, thing still gets better mileage than my wife's with her SX7, with M-10 installed. Had a set of tripples on my 01, Hauck Hushers and they never really performed up to expectations.