If you're looking to improve your vehicles performance than upgrading the transmission is a surefire way to improve it's consistency over time and under load.
Air Induction Kits- Cold Air Induction Kits - Ram Air Induction Kits - Air Filters
Performance Cooling- Performance Radiators - Performance Intercoolers Kits
Engine Tuning- Catch & Header Tanks
Performance Exhausts- Exhaust Manifolds - Exhaust Decats - Exhaust Downpipes - Exhaust Backboxes - Turbo Elbows - Performance Exhaust Systems
Performance Suspension- Adjustable Arms - Strut Braces - Wheel Spacers - Engine & Gearbox Mounts - Droplinks - Coilovers