It's a NA. I put alot of money into my NA, but it really isn't worth it for "performance" gains.
Just do a TT conversion.
Heres my list:
1990 NA
• Stillen High Flow Intake • ECU Upgrade (By ASH) • Stillen Cat-back Exhaust • Stillen Headers • LaBree Motor Sports Stainless Steel 2.5” mandrel bent with ss high flow cat’s Added 11.2006 • Exedy TT Clutch (modified bell housing and Starter shim by Brett Ramey) • Fidanza Flywheel • 18" XXR 530 Wheels-Chromium Black Finish +35, 18x8.75 all around. 5 MM spacer up front to clear the brake calipers. • Bridgestone Potenza 255/35/18 255/35R18 and 225/40/18 225/40R18 Staggered Set • Koni Yellow Shocks 8040 1601 KONI 1119Sport on the REAR 8041 1118Sport on the FRONT • Ground Control Coilovers GC-6025.03 • Fiberglass Mission Style spoiler