the right spring for your weight and aftermarket piston if any one does them or at least a revalve.but you need to know what it downfalls are all you wont improve a thing ,like does it bottom, does it kick,does it wallow you need to tell the suspension guy.another thing to check is the shock shaftworn and you might need a new seal head as well,as for the forks race tech does a emulator gold valve for the forks which would improve them.