Whats up bro, you have plenty to choose from kenne bell, procharger, vortech, whipple, paxton, hp turbo, precision turbo. They all work differently, & focus on different rpm ranges.
If u want torque out the ying yang go with kenne bell, or whipple. I would preferably go with kenne because of their experience. Or if u want upper rpm hp (3000 & up) u can go procharger, vortech, or paxton. & precision, or hp turbo for turbo applications. Paxton has been in the game the longest, & procharger makes some great systems with 3' piping.
To answer your other question it would be a good idea to get a new clutch setup, & stickier tires, nitto is top notch, idk much about the big names in the clutch game though. I hope this helps
2007 Saleen- Usual Bolts ons, C&L racer intake Fastlane dyno tune, with Zex 100 shot, bottle warmer, purge kit, TPS switch, TCI tq converter with 3000 stall, SPR stage 2 cams (530/555 lift)MMR Aluminum driveshaft, Steel flexplate, 4.10 gears, L&M throttle body, electric water pump,Steeda CMCP w/ nitrous ports, Full american racing exhaust with borla stingers, TCI ratch shifter
368 rwhp 365rwtq (N/A)
489rwhp 516rwtq (sprayed)