Subaru WRX STI GD/GR/VA
2004-2021
HPDE Overview
The STI brings 300+ hp, AWD traction, and rally-bred mechanical confidence to the track. The EJ257 engine makes boost aggressively and the DCCD (Driver Controlled Center Differential) allows tuning of the front/rear torque split for different track conditions. In the wet or cold, nothing in this price range puts power down as effectively. On track, the STI feels planted and stable. The AWD system provides mechanical grip that lets you get on the throttle much earlier than RWD cars. Turn-in is not as sharp as a lighter RWD car, but the STI compensates with relentless traction on exit. The Brembo brakes on all STI models are strong, though they heat up quickly given the car's weight. The challenge is heat. The EJ257 is notorious for running hot, and the turbo adds enormous thermal load. The stock cooling system is marginal for sustained track use, and the boxer engine's packaging makes airflow management difficult. Oil temperatures climb rapidly, and the turbo system needs careful cool-down procedures after track sessions.