In a sport-compact segment dominated by front-wheel drive Hondas, Subaru made a significant impact with its turbocharged, all-wheel drive debut of the GD Impreza WRX in 2002. Known as the “Bug Eye” WRX, this machine began to chip away at the sport-compact market, garnering a cult-like following. Powered by the EJ205 Boxer engine, this 2.0-liter mill with its 92mm x 75mm bore and stroke dimension and TD04L-13T turbocharger came from the factory with 227 horsepower. With the appropriate upgrades and recalibration of the ECU, nearly 300 horsepower could be safely attained. If your horsepower ambitions are higher, plan to invest in engine internals, cylinder head work and a larger turbocharger, along with the requisite ancillary fuel delivery upgrades.
Rally Bred Brother
The Subaru WRX STI raises the performance of the EJ205 with a larger, 2.5-liter EJ257 engine. Boasting 300 horsepower from the factory, the STI variant makes a significant leap in the way of performance. It also packed the technological advantage of Subaru’s rally-bred driveline and DCCD torque-split system. The flagship EJ257 engine features 95mm x 73mm bore and stroke dimensions and a larger turbocharger as well, offering some headspace for upgrades and output. With upgraded engine internals, proper turbo sizing and proper ancillary equipment, the EJ257 can easily support more than 500 horsepower.