More likely, the other way around. I expect they put one notch in the tranny cross-member because they decided on a single pipe. I forgot where I read the info "single pipe = more HP", probably on the AllPar site. Many mod's are silly. I have yet to see a Jap fart-canned car fly by me on the freeway. Usually, you see them in the slow lane, jarring their teeth at 55 mph because they f'ed up the suspension in lowering it and adding rubber-band tires, while making useless noise. To me a quiet, smooth dependable engine is ideal, not an over-cammed, over-carbbed blubbering pollution-maker that keeps stalling, w/ noisy exhaust bothering the neighbors, but then I wouldn't ride a messed up Harley either (endemic around here).
