make sure the spring is set in to the bottom cup correctly, there is a certain way the spring has to sit. the bottom cup looks like the bottom of the spring and it fits rite in.
i didnt have mine it right and i kept making a "twang" noise. all i did was jack up the front end and spun the spring till it popped in place.
03 SVTF #3804, full suspension, CM FX300, Torsen LSD, no cat, dual exhaust, Tom's tune. 167whp 154 wtq (dyno jet) and some other stuff. dyno- http://www.youtube.com/user/ken6x6#p/a/u/1/cKH4FX7c9L4