The 2004 Subaru Impreza WRX represents a pivotal moment in the evolution of the legendary WRX lineage, marking a shift toward a more refined and performance-focused driving experience. This specific model year sits at the intersection of the original GD boxer engine platform and the emergence of the next generation, offering enthusiasts a compelling blend of raw capability and daily usability. Understanding the nuances of this year's powertrain and chassis setup is essential for anyone considering ownership or simply appreciating the engineering that defined an era of Subaru performance.
The Heart of the Machine: The 2.0L Turbo Boxer
At the core of the 2004 Impreza WRX lies the horizontally opposed, turbocharged 2.0-liter flat-four engine, a design synonymous with Subaru's brand identity. This specific iteration of the EJ207 engine produced 227 horsepower and 235 lb-ft of torque, a significant increase over its naturally aspirated siblings. The turbocharger, a Mitsubishi TD04H-20G model, spools efficiently to deliver power across the upper rpm range, providing that signature WRX surge off the line and through the mid-corner exits. The flat-six configuration of the boxer engine results in a low center of gravity, which enhances handling stability and contributes to the car's planted feel during aggressive cornering.
Engineering the Power Delivery
Power is sent to the wheels through a robust 5-speed manual transmission, a choice that prioritizes driver engagement and mechanical efficiency over the convenience of an automatic. The close-ratio gear box is perfectly suited for harnessing the turbo's pull, allowing enthusiasts to keep the engine in its optimal power band. For those seeking ease of use, an optional 4-speed automatic transmission was available, though it was often criticized for being slow to react and less engaging than its manual counterpart. The symmetrical all-wheel-drive system, paired with the transmission, ensures that the power is distributed effectively to the ground, providing exceptional traction in various driving conditions, a key trait for any WRX.
Chassis Dynamics and Handling Character
The 2004 model year brought refinements to the chassis that improved the car's dynamics significantly. The suspension setup featured MacPherson struts at the front and a multi-link rear design, which worked in concert to deliver a balance of comfort and control. While not as stiff as the subsequent models, the chassis provided a planted feel that inspired confidence on winding roads. Steering feedback was direct and communicative, allowing the driver to sense the limits of adhesion and adjust inputs accordingly. This combination of suspension, steering, and weight distribution is what made the WRX feel like a true driver's car, rather than just a turbocharged grocery getter.
MacPherson strut front suspension for responsive handling.
Multi-link rear suspension for improved traction and stability.
Symmetrical All-Wheel Drive system for superior grip in all weather.
Electric power steering for improved maneuverability at low speeds.
Exterior and Interior Design Language
Visually, the 2004 Impreza WRX commands attention with its aggressive stance and functional design. The large, honeycomb-style grille is flanked by the iconic bubble headlights, a design necessitated by the larger turbocharged engine. The side skirts, rear spoiler, and widened wheel arches all signal its performance pedigree, while the standard 16-inch alloy wheels shod in all-season tires provide a perfect marriage of form and function. Inside, the driver is greeted by a cockpit-like environment, bolstered bucket seats, and a steering wheel that puts all the necessary controls within easy reach. The quality of the interior materials was a step up from previous generations, with more tactile plastics and supportive seating contributing to a premium feel.
