Intro
The 2005 Subaru Legacy GT marked a pivotal moment in Subaru’s lineup, representing the fourth generation of the Legacy family. Launched as part of Subaru’s attempt to move upmarket while maintaining its performance heritage, this model combined executive car comfort with rally-bred engineering. The GT variant specifically carried Subaru’s performance torch beyond the more recognized WRX and STI models, offering sophisticated power in a more mature package.
In Japanese domestic market culture, the Legacy GT commands respect as the “gentleman’s Subaru” – a vehicle that delivers the brand’s signature turbocharged boxer performance without the boy-racer aesthetic of its Impreza siblings. Its status in JDM circles is further enhanced by its rarity compared to the ubiquitous WRX, making it a connoisseur’s choice that demonstrates deeper knowledge of Japanese performance cars.
This particular build stands out for threading the needle between preserving the Legacy GT’s understated dignity while enhancing its performance capabilities. Unlike many modified Subarus that lean heavily into rally-inspired aesthetics, this example showcases the platform’s potential for balanced modification that respects the original design philosophy while addressing the model’s few shortcomings.
Builder Profile
After moving from Gunma, Japan to Southern California in 2008, Takeshi Yamamoto brought with him a decade of experience working at an STI specialist shop. Now operating his own performance garage called “Boost Logic Dynamics” in Torrance, TK approaches the Legacy GT platform with a philosophy that balances daily driveability with weekend track potential. His engineering background gives him a methodical approach to modifications, preferring carefully selected quality components over flashy aesthetics.
TK has become a respected voice in the SoCal Subaru community, regularly participating in NASOIC meets and organizing technical workshops for enthusiasts. His Legacy GT represents his belief that the platform deserves the same attention as its WRX/STI siblings, showcasing its potential through thoughtful, purpose-driven modifications rather than chasing dyno numbers.
Why We Love It
The 2005 Legacy GT embodies Subaru’s motorsport DNA in a sophisticated package that transcends the boy-racer aesthetic. While the STI dominated headlines, this sleeper GT quietly offered the discerning enthusiast the EJ25 turbocharged flat-four producing 250 horsepower and 250 lb-ft of torque – figures that belied its true potential with minimal aftermarket intervention.
The hydraulic steering delivers communication through your fingertips with a directness lost to modern electric systems. There’s a mechanical honesty in how the Legacy GT connects chassis to tarmac – the symmetrical AWD system distributes power with an intelligence that feels almost precognitive on mountain passes.
What truly distinguishes this fourth-generation Legacy is its balanced duality. Unlike its rally-bred WRX siblings, the GT pairs performance with genuine refinement – the double-wishbone rear suspension providing compliance without compromising poise. The available 5-speed manual transmission offers precise, short throws that reward deliberate inputs.
Its understated presence represents peak mid-2000s JDM philosophy – function dictating form. The subtle hood scoop, quad exhaust tips, and 5-spoke wheels hint at capability without shouting. Today, these limited-production GTs have developed a cult following, appreciated by those who recognize the significance of what may have been the most balanced expression of Subaru’s performance engineering during a pivotal era.
Mods
ENGINE & DRIVETRAIN
- COBB AccessPORT Stage 2 tune
- Invidia downpipe
- HKS Hi-Power exhaust
- GReddy FMIC intercooler
- TurboXS blow-off valve
- Perrin turbo inlet
- Killer B oil pickup
- Samco silicone hoses
- Exedy Stage 1 clutch kit
- Cusco limited slip differential
SUSPENSION & BRAKES
- KW Variant 3 coilovers
- Whiteline front and rear sway bars
- Cusco strut tower bar
- Perrin endlinks
- StopTech slotted rotors
- Hawk HPS brake pads
- Goodridge stainless brake lines
- Cusco master cylinder brace
WHEELS & TIRES
- Volk Racing TE37 18×9.5 +22
- Yokohama ADVAN Neova AD08 245/40R18
- Project Kics R40 lug nuts
- Gorilla wheel locks
EXTERIOR / AERO
- JDM Spec B front lip
- Chargespeed side skirts
- STI rear diffuser
- HIC rear window visor
- JDM clear corner markers
- Hella Supertones (behind grille)
- 35% window tint
- JDM rain guards
INTERIOR
- Bride Zeta III driver seat
- Takata 4-point harness
- Defi Advance BF gauges (boost, oil temp, oil pressure)
- Nardi Deep Corn 330mm steering wheel
- Works Bell quick release hub
- MOMO shift knob
- JDM double din bezel
- STI pedal set
- WeatherTech floor mats
ELECTRONICS / ECU
- COBB AccessPORT V2
- Ecutek reflash with custom maps
- Pioneer AVIC-Z1 head unit
- Alpine PDX amplifier
- JL Audio 10W6 subwoofer
- AEM wideband O2 sensor
- GReddy Profec B Spec II boost controller
- Valentine One radar detector (hardwired)
Driving Impression / Build Philosophy
The 2005 Subaru Legacy GT has been methodically modified with a clear philosophy of balanced performance and daily drivability. This build strikes a harmonious integration between power delivery, suspension dynamics, and aesthetic enhancements without sacrificing reliability.
The power modifications work in concert, from the STI turbocharger to the upgraded intercooler and exhaust components, creating a cohesive powertrain that delivers linear boost and predictable throttle response. The VF39 turbo pairs perfectly with the supporting fuel system upgrades to create substantial midrange torque without the peaky, all-or-nothing delivery of more aggressive builds.
Suspension components have been selected with circuit performance in mind while maintaining street comfort. The Bilstein/RCE Yellow combination provides controlled body movement and enhanced cornering precision without the harshness of a dedicated track setup. The chassis bracing and improved brake components complement these suspension upgrades, resulting in a car that feels planted and confident during spirited driving.
This Legacy GT build represents a focused street/circuit philosophy, prioritizing balanced performance that excels in weekend canyon carving and occasional track days while remaining comfortable for daily commuting. Unlike dedicated show cars or extreme time attack builds, every modification serves both form and function, creating a cohesive package that enhances the Legacy’s inherent sporting character without compromising its practical nature.
FAQ
How reliable is the 2005 Subaru Legacy GT?
The 2005 Legacy GT is generally reliable when properly maintained, with many examples exceeding 200,000 miles. Regular oil changes every 3,000-4,000 miles are critical due to the turbocharged EJ255 engine. The 5-speed manual transmissions tend to be more durable than the 5-speed automatics, which can develop valve body issues around 100,000 miles.
What are the most common issues with the 2005 Legacy GT?
Common problems include banjo bolt filter clogs leading to turbo failure, oil pickup tube cracking, head gasket failures (though less common than non-turbo models), turbo wastegate actuator arm cracking, and pre-catalytic converter deterioration. Many of these issues can be prevented with proactive maintenance and upgrades.
What is the tuning potential of the Legacy GT?
The Legacy GT offers excellent tuning potential with its turbocharged 2.5L EJ255 engine. A stage 1 tune alone can increase output to approximately 275-290hp. With supporting modifications (downpipe, intake, intercooler), stage 2 builds can reliably produce 300-325hp. With forged internals, larger turbochargers, and proper tuning, 400+ hp is achievable.
What are the best initial modifications for the Legacy GT?
The most cost-effective initial modifications include a turbo-back exhaust, cold air intake, and a professional tune. These can yield 40-60 additional horsepower. Other worthwhile upgrades include an upgraded intercooler, aftermarket boost controller, and a VF52 turbo swap from the 2009+ WRX for improved response and power.
How does the Legacy GT compare to the WRX of the same era?
The Legacy GT offers similar performance to the 2004-2005 WRX but with more luxury features, better sound insulation, and a more mature aesthetic. The Legacy GT weighs approximately 200-300 pounds more but compensates with slightly more torque. Many owners describe it as a “grown-up WRX” with superior highway manners while maintaining most of the performance capabilities.
What should buyers look for when purchasing a used 2005 Legacy GT?
Prospective buyers should check for maintenance records (particularly timing belt service at 105,000 miles), inspect for oil leaks around the turbo and valve covers, verify the condition of the banjo bolt filter, check for smooth transmission shifts, and look for modifications that might indicate hard use. A pre-purchase inspection by a Subaru specialist is highly recommended.
How expensive is the Legacy GT to maintain compared to non-turbo models?
The Legacy GT has approximately 25-30% higher maintenance costs than non-turbo models due to the more complex powertrain. Premium fuel is required, and oil changes using synthetic oil are necessary. The turbocharger system introduces additional potential failure points, and parts like the catalytic converters and turbo components can be expensive to replace if they fail.
Conclusion
Even nearly two decades after its release, the 2005 Legacy GT continues to stand as a demonstration of Subaru’s engineering prowess. With its perfect blend of everyday practicality and exhilarating performance, this sleeper sedan remains relevant in an era of increasingly homogenized automotive design. The Legacy GT’s combination of symmetrical all-wheel drive, turbocharged boxer engine, and understated aesthetics offers an authentic driving experience that modern vehicles often sacrifice for technology and convenience.
The Legacy GT has secured its place in JDM culture alongside icons like the WRX STI and Mitsubishi Evo, particularly in its wagon form. Its cult following among enthusiasts speaks to the car’s genuine character—a vehicle that delivers driving enjoyment without shouting about it. For purists seeking the quintessential Japanese sports sedan experience with reliability and tunability, the 2005 Legacy GT continues to represent one of the most compelling options on the used market, embodying the golden era of Japanese performance cars that prioritized driver engagement above all else.