sorry to say but there is not alot of power mods for the SC430. There are a few custom turbos out there pumping over 700hp and tq and they are FAST as hell, lookin into low 11s high 10s. for suspension you can get Tein, they are considered the best for fine tuning with sport/luxury. You can get a brembo brake upgrade. There is a Blitz full cat back exhaust, but if you get a custom turbo you might as well go custom exhaust. Blitz,Injen, and Weapon R make an intake (i suggest weapon R), NOS.
there are only a few good body kits out for it..
the auto-couture
Junction produce (that 2-tone is ugly, but its to show the kit)