If you want more power: 12 hole mod the airbox lid, get a muzzy exhaust, dynatek cdi, upp crossovers, and get clutch work from www.vforcejohn.com suspension: everybody makes a rear shock, but elka had the best front spring package, which are now discontinued. Jetting: only use Keihin jets. I designed steering stabilizer clamps sold by atvtrickstuff.com to be used with kfx 450 stick dampeners. Front suspension and steering is the most inhibiting performance factor as it will fatigue the rider long before you run out of atv potential.