If you understand the way BRP's engine computer works , you will know that the only change that will occur …. will be the sound. Prior to computer controlled engine management systems..... ie. carburetor & early fuel injection …. there were things you could change and increase your HP ….. not any longer, ...now you have to re-map the computer to achieve HP increases. I will apologize and stand corrected upon seeing Genuine DYNO improvements ……. and I use the Improvements because I have seen quite a few so-called MODS that actually reduce HP …..these are usually LOUDER than stock ……. good luck ….. Mike