Stage IV - Ultimate Performance Package
Just as capable at an autocross or a track event as on the street, Stage IV is quite simply the ultimate WRX. Stage IV nets nearly 300 wheel horsepower at the wheels thanks to a Stage IV Power Upgrade. Included are an ECU reflash, higher flowing injectors, upgraded fuel rails, high-flow fuel pump, ball-bearing turbo upgrade, as well an Inconel uppipe and a high-flow turbo-back exhaust. A large top-mount intercooler rounds out the power package. The ASR body kit is accentuated by our Super Lightweight forged 18" X 8" five-spoke wheels in silver, gold or white. The Stage III suspension (which includes adjustable tubular swaybars, swaybar end links, and coilover suspension with cockpit adjustable electronic dampers) is further upgraded in Stage IV. Tubular rear control arms and adjustable control links include spherical bearings to allow for better control, while the front control arms are replaced with the factory aluminum components with an anti-lift kit. The chassis stiffening kit in Stage III is also included. Brakes are upgraded to a four-wheel big-brake kit, which includes four-piston front calipers and two-piston rears. Upgraded pads, two-piece slotted rotors, braided brake lines and upgraded fluid complete the package. Finally, the car is topped off with an ASR decklid badge, Stage IV fender decals and an ASR window tint.
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