As of right now the E-Tec 800 models are not easy to get big horsepower out of. However we here at BMP have the best remedy on the market. A solid 6-7hp gain from 6500rpm and up! Field tested and approved by many riders. We send you our industry leading Performance Manifold, Either our Powder Lite or Full Velocity Muffler, and Sensor Adapter. Great gains that can be compensated with stock clutching, but for best performance click the option to add our Stage 2 Clutch Kit (includes pin kit, helix, primary & secondary springs).