What kind of increase in power and torque would my buddy get if he purchased this and put them on his stock 400ex(that runs exceptional for a stock bike....surprised lots of people with pipes how well it keeps up).....


HMF Full System Exhaust
Alba CDI Box
Sparks Clutch Kit
Spark Advance Key
Sparks Air Filter - Open Air Box


What kind of hop with that system....and how much would a piston and cam help those mod's.....