Here's the deal I do a lot of trail riding so im mostly looking for bottom to midrange power, but I dont wanna give up too much top end...I already have FMF pipes and Boysen reeds...Ive done some research & from what ive read in these forums the best mods i could do, short of porting, would be: Air filter(ditch the lid), adjust timing +4, cool heads & domes, jet kit, front sprocket, and im open for anything I might've left out...Here's my questions, what are your suggestion on the best air filters/kits? How exactly will an adjustible timing plate affect the performance and durability over the long run? how much difference would there be in getting cool heads & domes vs shaving the stock head? jet kit, im clueless??? Should i change the sprocket or would that sacrifice more speed than its worth? & lastly will this put too much strain on a stock crank? Sorry I know that's a lot questions, but I just wanna be sure im making the right decisions before I do anything. Im open for anything????