How much performance gains would a foreman 450 see from say highlifter's piston/cam package compared to say the performance kit they offer?

 

the performance kit with the jet and needle kit, K&N air filter and HMF pipe increases the horsepower from around the stock 16 hp to around 21.5 hp. You can really feel the torque while riding all the way through the rpm range. All the performance people I have talked to say that the honda is really badly choked up from the factory and there are loads of power to be released! I guess Honda may be a little over concerned about noise levels and smog control and go out of their way to meet and exceed them..the performance kit really woke up my 450 foreman so i bet the piston cam kit you are looking at really would give it a boost and probably would not hurt the realibility of it if you keep it serviced well..Good luck and let me know what you find out.