Harman Motive GT-Series Turbo Kit (Subaru WRX 2002-2008 / STi 2004-2008)
The Harman Motive GT-Series Turbokit for Subaru WRX/STI is the result of years of hands on tuning, racing and installation experience. We've taken everything learned from working with hundreds of kits and vehicles and applied them to what we believe is the best kit available for the Subaru.
Features
- Made in USA
- 100% TIG Welded
- 100% Mandrel Bent
- 304 Stainless Steel Construction
- 3” V-Band Downpipe
- Smooth Wastegate Recirculation
- Garret GT Ball-Bearing Turbos (400-600hp)
- Available with Catalytic converter
Benefits
- Wastegate mounted away from transmission for good clearance and easy installation
- Properly designed large-MAF intake won’t cause idle/dying issues and is easy to tune
- Basemaps are available for you and your tuner (tuning is required)
- Rerouted wastegate keeps noise down
- Works with APS or Harman Motive FMIC
- Fits with stock or aftermarket headers
- V-Band Downpipe connection for easy installation and leak free seal
- Turbo support bracket for years of reliable performance
Our kit was designed to do everything well so you can enjoy your car in all driving situations. We have designed the uppipe to provide the best balance of spool and top-end power. We have rerouted the wasteagate as smoothly as possible for precise boost control without unnecessary noise. We have extensively tested our kit on the track and in competition with rock steady reliability, excellent power output, and repeat victories.
While ready for the race track, the Harman turbo kit makes a great daily driving setup too. We have installed our kit on many stock engined STIs producing 350-400whp daily with great reliability. You'll appreciate the great idle, good off boost power, and instant response of the Garrett family of turbochargers.
Turbo Options
GT3071R - The smallest of the GT series turbos, this turbo is recommended for daily drivers on stock motors. Full boost is achievable at 3800rpm with peak power occurring around 6000rpm. Capable of 400whp at 25psi on the stock block, you can still run down even the fastest cars with this turbo.
GT3076R - The big brother of the GT3071, this turbo has a larger compressor and turbine. While it shifts the powerband north, lag increases by only a few hundred RPM. If you have high quality fuel, this is a great turbo that will pull hard to redline on stock and mild 2.5l motors.
GT3582R - Perhaps the world's most famous turbo. This gem can provide 500+ whp at 25psi on built motors. This is best for top-end on stock motors or all out track dominance on your built engine. Still spools fast enough for daily duty, but you'll have more fun with a faster spoiling GT30R if you're into canyons and HPDE.
Intercooler Options
For 2004-2007 STIs, the kit is designed to fit with APS DR525 and DR725 FMIC. No modification is required. The APS intercooler for the GD chassis is unmatched in fitment and performance.
For 2008 STI, we offer the Harman Motive FMIC. Developed on JC Meynet's TimeAttack STI, we have designed this FMIC to provide the best mix of performance, spool, and serviceability. We have gone through great effort to route the piping to minimize heat interference. (Coming soon for GD chassis 2002-2007).
The 2008 WRX and Legacy models require a different intercooler routing because of the intake manifold. These are available by special order only.
Harman Motive Intercooler Specs
- Mandrel bent aluminum piping (2.25" and 2.5")
- Hot side runs under intake manifold
- 28 x 9 x 3.5 Intercooler Core (800+hp)
- Premium Hose Techniques hose and T-bolt clamps includes
- Pipe routing keeps cold side away from turbo heat
- Charge pipe does not run through fender allowing for a huge intake filter without wheel/fender clearance issues (you racers know what we're talking about!)
Harman Motive Intercooler Benefits
- Designed with serviceability in mind, all hoses and connection are easily accessible.
- Piping does not run through passenger side fender giving extra room for intake piping and filter (and keeping your fenderliner in one piece!)
- T-Bolt clamps and high quality hose to keep your pipes connected
- Piping is sized for fast spoolup and instant throttle response
Dyno Graphs
GT3071R (.82AR): 2005 STI w/ stock engine, APS DR525, Perrin equal-length headers, catless, 91 and 100oct
Video 1  Video 2
GT3582R (.82AR): 2005 STI w/ stock engine, APS DR525, catless, 91 and 100oct
Video 1
GT3582R (.82AR): 2006 STI w/ Cosworth 2.6L Longblock, HM FMIC, catted, 109oct
Video 1 Video 2 Video 3
GT3076R (.82AR): 2008 STI w/ stock engine, HM FMIC, catted, 91oct
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