2008 Subaru Impreza 4-Door Builds: Trims, Specs, and What Separates Them

The 2008 Subaru Impreza sedan arrived during a significant generational shift. Subaru had just redesigned the Impreza for the 2008 model year, moving to a slightly larger platform while keeping the car's core identity: symmetrical all-wheel drive, a horizontally opposed ("boxer") engine, and practical everyday usability. The 4-door sedan offered the same mechanical foundation as the hatchback but with a traditional trunk layout — a meaningful distinction for buyers who preferred that body style.

The Core Platform: What Every '08 Impreza 4-Door Shares

Every 2008 Impreza sedan — regardless of trim — is built around Subaru's symmetrical full-time AWD system. Unlike part-time or on-demand AWD setups, Subaru's system distributes power to all four wheels continuously. This architecture influences handling balance, drivetrain feel, and long-term maintenance requirements equally across trims.

The standard powertrain is a 2.5-liter horizontally opposed four-cylinder (EJ253) producing approximately 170 horsepower. Transmission choices are a 5-speed manual or a 4-speed automatic, depending on trim. The boxer engine sits low in the chassis, contributing to a lower center of gravity compared to conventional inline or V-configuration engines.

One important exception: the WRX, which uses a turbocharged 2.5-liter (EJ255) producing around 224 horsepower and pairs exclusively with a 5-speed manual. The WRX is mechanically distinct from the rest of the lineup — not just a higher trim, but a fundamentally different performance build.

2008 Impreza Sedan Trim Levels

Note: Trim availability and exact feature packaging varied by region and market. Not all combinations were offered everywhere.

What Changes Across Non-WRX Trims

For the naturally aspirated trims (2.5i, 2.5i Premium, 2.5i Sport), the drivetrain is effectively identical. What separates them is equipment level:

• 2.5i (base): Cloth seats, basic audio, manual windows in some configurations, steel wheels
• 2.5i Premium: Added alloy wheels, upgraded audio, power accessories
• 2.5i Sport: Sport-tuned suspension, fog lights, upgraded interior trim, slightly more aggressive exterior styling

None of these trim differences affect the fundamental driving dynamics in major ways — the suspension tune on the Sport is the most mechanically meaningful distinction in the non-WRX group.

The WRX: A Different Build Entirely 🔧

The 2008 WRX sedan shares its body with the standard Impreza but diverges significantly underneath. Key differences include:

• Turbocharged EJ255 engine with an intercooler
• Performance-tuned suspension with larger anti-roll bars
• Larger Brembo brakes (on some configurations)
• Limited-slip rear differential on certain packages
• Hood scoop for intercooler air intake — functional, not decorative
• Higher fuel octane requirement (premium recommended)

The WRX's turbo system also introduces maintenance considerations that don't apply to naturally aspirated trims — turbo cool-down, oil quality, and more frequent oil changes are commonly recommended by owners and technicians familiar with this engine.

Fuel Economy Across the Lineup

The naturally aspirated 2.5i trims returned roughly 20 mpg city / 27 mpg highway with the automatic, slightly different with the manual. The WRX, given its performance tuning and turbocharger, returned lower figures — approximately 19 mpg city / 25 mpg highway — though real-world mileage varies considerably with driving style.

These are general figures from the era. Actual fuel economy depends on driving conditions, maintenance history, tire specification, and how the vehicle has been used over its now 15-plus-year life.

What Matters When Researching a Used Example Today

By 2025, every 2008 Impreza on the market is a used vehicle with significant history. The build your research starts with is only part of the picture. 🔍

Factors that significantly affect what you're actually buying:

• Maintenance history — Subaru boxer engines from this era are sensitive to oil change intervals; neglect can lead to head gasket issues
• Accident history — AWD vehicles with frame or subframe damage can have alignment problems that are expensive to correct
• Rust — The 2008 Impreza's generation is known to rust in high-salt regions; underbody and wheel wells deserve close inspection
• Modifications — WRX examples especially may have been tuned, upgraded, or tracked, which changes their condition profile entirely
• Transmission type — Manual vs. automatic affects both driving character and long-term maintenance needs
• Head gasket condition — The EJ253 (non-turbo) had documented head gasket concerns; the EJ255 in the WRX is generally considered more robust in this respect, though not immune to issues

The Gap Between Trim and Condition

Knowing a 2008 Impreza is a "2.5i Sport" or a "WRX" tells you what it was built to be. What it actually is today depends on how it was driven, where it lived, and what work has or hasn't been done to it. Two identical builds from the same model year can be in dramatically different states of repair after 15-plus years on the road.

The trim level sets the baseline. Everything else — geography, mileage, maintenance records, inspection results — determines what that baseline is actually worth to any specific buyer in any specific situation.