02 Vipers usually need the shocks revalved. Replace and shim all the skid bushings and atleast a 1 inch track. Engine mods: trailport the cylinders ( wakes up the low-mid range power) Pipes will add 20-30 claimed hp depending on manufaturer.Expect to spend some time tuning the engine to run pipes ( rejetting). Most important mod would be clutching. Most of your gains will be found in the clutches. There is alot of good info on these sleds in other forums as well as this one like ty forums or hcs.Take your time and do a little research. Good luck
