it is a bit tricky but possible.. buell already changed gear on the sporty engine, but a good compromise ( and i deed it with mine.now is a monster bike.. 135 hp plus 40 km per hours.. use high compression pistons from wiseko the 10.5:1 a withe brothers exaust, and a hipercharger from kuriakyn you can find everithing her at half the price from hd dealer.. www.jirehcycles.com