APR Performance for Subaru WRX & STI

For the VA-generation STI — the final EJ25-powered STI and still the benchmark for Australian time attack — the GTC-300 adjustable wing is the go-to choice. APR's 3D airfoil profile delivers high peak downforce with CFD-validated efficiency, and the adjustable 0–15° angle of attack lets you tune aero balance track by track. Pre-preg carbon fibre construction, autoclave-cured, with 10mm 6061 billet aluminium pedestals that mount to factory locations on the STI boot lid. This is the wing you see on the majority of serious VA STI time attack builds.

For the GR-chassis Impreza WRX and STI — the hatch and early sedan generation — the GTC-200 adjustable wing is sized correctly for the Impreza's dimensions. Same 3D airfoil design and adjustable angle of attack as the GTC-300, scaled to suit the narrower track of the GR body. Pre-preg carbon fibre construction and factory mounting locations.

Balancing rear downforce with front grip is critical — and APR's carbon fibre front splitters are designed specifically for each WRX/STI generation. For the 2018–2021 VA STI, three splitter variants are available so you can match the splitter to your existing front-end setup:

• VA STI 2018–2021 — APR lip fitment
• VA STI 2018–2021 — OEM lip fitment
• VA STI 2018–2021 — no-lip fitment

Earlier generations are also covered — the 2015–2017 VA splitter and the 2006–2007 GD splitter for legacy builds still running period-correct aero. Each splitter features a fully functional undertray with stainless steel support rods for strength and stability under high-speed loads. For the theory on why splitters matter, read our front splitter guide.

To fine-tune front aero balance, APR carbon fibre canards for the 2015–2017 STI add localised front downforce and direct airflow around the front wheel arches. Pre-preg carbon fibre with a UV-resistant clear coat — a simple bolt-on upgrade that complements a splitter or works on its own for lighter aero setups.

For a complete aerodynamic transformation, the APR carbon fibre aero kit for the 2015–2017 WRX/STI bundles the front air dam, side rocker extensions, and rear bumper skirts into a single package. This manages airflow from front to rear for balanced downforce and reduced turbulence along the entire car, and is the cleanest way to transform an STI's aero profile in a single purchase.

APR also offers functional engine bay and brake components for the WRX/STI platform. The carbon fibre brake cooling kit for the 2018–2021 STI ducts cool air directly to the Brembo front calipers — a genuine functional upgrade for track builds where brake heat is the limiting factor. For 2008–2014 GR STI builds, brake cooling plates and rotor backing plates are available to achieve the same result on the older chassis. The carbon alternator cover for the 2008–2014 GR adds engine bay presentation for show and display builds.

The short version: GTC-300 for VA-generation sedan builds where you want maximum downforce and adjustability — the standard choice for serious VA STI time attack cars. GTC-200 for GR-chassis builds where the smaller span suits the narrower body dimensions. For chassis-mount swan-neck time attack builds at the pointy end, the GT-1000 or GT-2000 are the step up — wider span, more aggressive profile, more downforce. For the full breakdown of how the APR GT-series wings compare, read our GT-250 vs GT-1000 vs GT-2000 buyers guide, or see real-world application in our WTAC 2026 APR aero guide.

A Subaru running serious APR aero is asking more of its chassis, brakes, and driveline than a stock car ever does. Match the build:

• Blouch Performance turbos — the benchmark EJ25 turbo upgrade range, including the DOM 1.5, 2.5 and 3.0 G2R platforms
• DIXCEL brakes for WRX & STI — M-Type, Z-Type, and R-Type compounds for Brembo and factory calipers
• KORSH exhaust for Subaru — WRX and STI downpipes, mid-pipes, and cat-backs
• Radium Engineering for Subaru — top-feed fuel rails, fuel system plumbing, catch cans for EJ and FA engines
• Injector Dynamics for Subaru — ID1050x, ID1300x, ID1700x for high-power WRX/STI builds
• Hardrace suspension — bushings, control arms, and camber adjustment for chassis running aero load

For setup with serious aero loads, our camber setup guide has WRX/STI-specific recommendations, and our Blouch turbo comparison covers the power side of the equation.