Had my cobra slashcut classic pipes and kuryakyn/thunder mfg hypercharger installed on my 750 Spirit today. What a awesome addition to my bike. If anyone tells you the the Hyper is just cosmetic, they are wrong. Installed jet kit, modified carb for vacuum line to operate butterflies, ran vent line to hyper to prevent high speed choking and spitting and it runs flawlessly through the entire spectrum. Highly recommend the hyper as long as it is installed properly. The increase in performance is worth it and how great it looks seeing the butterflies opening and closing when revving the engine. Now I am ready to hit the ozarks next month.