My Saleen is a 2008 Racecraft. Saleen installs their supercharger and larger injectors to the stock 4.6 Ford block, they don't do anything to the engine (other than software tuning). They also install their springs and shocks, and a few silly things to the interior (embroidered headrests, 180mph speedo, leather wheel, etc.). It was a nice daily driver.
I was stupid and had JDM up the boost (12 psi on a stock 4.6 shortblock is NOT a good idea). The car was a lot of fun. If I would have stayed on the street, she'd probably be fine. But even HPDE's are rough on cars. She's almost back together, and actually runs and drives. Forged shortblock, T56 Magnum, 3.73's with a Torsen diff., brembo brakes (yes, the little 4 pistons ones), MCS coilovers with 400/225 springs. Probably too much car for me... I'll be back on the track in the spring.