[paulicat]

I just put the saleen suspension kit on mine, it wasn't preassembled so I needed a spring compressor.
Its pretty straightforward stuff, the only tip I can pass on is when you do the rear suspension, make sure you do not tighten any bolts while the car is in the air. Put everything together, but don't torque it down. Lower the car down from the jack stands , then torque it down. The alternative method is there is a ride height design measurement that can be made between the lower control arm and the frame rails, I don't recall the exact details, but its mentioned in the haynes manuals.
Speaking of lower control arms...unless you've had the bolts out recently, or had the arms replaced recently, be prepared for the seized bolts that hold them in.
Unfortunately, if/when they seize, you need new arms, no ifs, ands or buts about it.
And don't forget the wheel alignment when you're done. :)
Good luck with the install!