Subaru had a hit with their Impreza model. The well-mannered, safety sedan featured a boxer engine and all wheel drive drivetrain. This hit turned into a homerun with the WRX. The STi version of the Impreza is a grand slam!
In 1994 Subaru introduced the Subaru Tecnica International (STI) versions of the WRX in Japan. The Subaru Impreza WRX STi wouldn’t be introduced to the US market until 10 years later for the 2004 model year. This model, designated chassis code GD, bumped the displacement up half a liter over the WRX to a 2.5. This first generation US market STI saw yearly updates with cosmetic tweaks and performance improvements.
The release of the USDM Impreza WRX STi coincided with COBB Tuning becoming the go-to aftermarket tuning solution for the Subaru Impreza WRX which debuted 2 years prior. The rest is history.
COBB has been the leader when it comes to STI performance parts and tuning for nearly two decades. From the humble beginnings of AccessFlash, which initially required ECU removal, to the current v3 with infinite capability, COBB continues to push the envelope on what’s possible with the stock Subaru ECU.
COBB Tuning approaches design by taking the entire vehicle-platform into account as a complete system. Our ultra-high-quality performance products and services are professionally engineered, thoroughly tested and backed by industry leading customer service to ensure that they meet our objectives and exceed customer expectations.
We are a one-stop firm with an enviable set of qualified skills and the exceptional ability to design, engineer, manufacture, test and service our own products under one roof. Whether it’s our state-of-the-art Accessport ECU programmer, our exceptional bolt-on performance products, COBB Tuning has the experience, skill and attitude to meet your Subaru WRX STI’s specific needs.
Our engineers rigorously test our Hard STI Parts to find the right order and combination for the best incremental power gains. Maps are created and tested to tune the ECU so that it supports and takes advantage of each part. With these results, COBB is able to create the Upgrade Path of Staged Packages that have all the necessary parts to upgrade your WRX STI. . Each Stage Package incorporates the parts below. You can start with Stage 1 or immediately get everything and go straight to Stage 3+ Flex Fuel! Learn more about The COBB Way.Stage Packages
Looking for Subaru STI performance parts? It all starts with the Accessport! The Accessport is the world’s best selling, most flexible ECU upgrade solution for your STI. Simply plug this device into your car’s OBD port and you have the capability to reflash the ECU to enjoy power gains, custom features, and other improvements immediately! All of the off the shelf maps are included at no additional cost and free updates are simplified with Accessport Manager. It’s the last engine management solution you’ll ever need for your Subaru WRX or Subaru WRX STI!Accessport
An upgraded intake is first on the list for one of the best car mods and ours at COBB are top of the market when it comes to Subaru STI parts. It checks all the boxes by adding to the aesthetic under the hood, potentially adds some horsepower, and best of all, sounds amazing!
The intake is the front-line of your engine’s operations. It intakes the air and distributes it to the turbocharger. If there is a restriction here, an upgrade can yield some significant power gains.
The COBB Intake and integrated airbox look great and have the combined benefits of a short ram intake and a cold air intake without any of the negatives. The system utilizes several unique features in an effort to maintain optimal flow for performance while minimizing turbulence that can cause engine management problems. Additional air induction modifications are available to further reduce pre-turbo restrictions and yield the most available power from your Subaru STI.COBB SF Intake
Get those spent exhaust gasses out of the turbo fast for more horsepower. This mandrel bent exhaust uses twin straight-through mufflers terminating in beautifully laser-etched 3.5″ quad-tips to make your presence known in the way that only COBB Subaru exhausts can provide. The outstanding craftsmanship and attention to detail are evident in every aspect of our gorgeous turbo back exhaust! And it doesn’t end there. Cat-backs, Downpipes, Upipes, Heatshields, and more! There’s an entire line of COBB exhaust modification for your Subaru WRX or STI.Exhaust
Looking for an effective solution to eliminate inconsistent power delivery from your STI? Look no further than the COBB Tuning Front Mount Intercooler. The factory top mount intercooler can easily be over worked and overheated due to its size and location. Thus, the intake air temperatures rise causing a loss in power. Replace your factory intercooler with the COBB Tuning Front Mount Intercooler to ensure that your engine is receiving the coolest possible air, giving you more power!Intercooler
If you’re adding power modifications to your Subaru STI you’ll quickly find the limit of the stock injectors. In fact, with only the intake and turboback exhaust installed on a 2015+ STI, the injectors are over-capacity. This is why COBB offers fuel upgrades that include Fuel Rails, Fuel Rail Line Kit, Fuel Rail Line Kit to Flex Fuel, Fuel Pressure Regulator for Fuel Rail Kit, Flex Fuel Ethanol Sensor Kit, Fuel Pressure Sensor Kit, Top Feed 1050x Fuel Injectors, and the AEM High Flow Fuel Pump!Fuel Upgrades
The COBB TD05H-20G is an ideal turbo upgrade for those looking to increase the top-end power and performance of their STI while maintaining low and mid-range response. Capable of producing 400hp and retaining excellent throttle response, the COBB 20G is a perfect turbocharger for street or track use!Upgraded Turbo
Looking for a better feel when shifting your STI? Looks no further than COBB drivetrain upgrades. These upgrades can significantly reduce shift throw and shift slop. We’ve got you covered with the COBB Tuning Subaru Rear Shifter Bushing, Subaru 6-Speed Double Adjustable Short Throw Shifter, Subaru 6-Speed Front Shifter Bushing, Subaru Reverse Lockout Pull, and the Subaru 6-Speed COBB Knob.Drivetrain
Upgrading suspension components is a great way to improve the looks and handling of your Subaru STI. Whether you want a more track focused setup or are wanting to improve the looks of your daily driver without sacrificing comfort, COBB has a solution with coilovers, lowering springs, and sway bars.Suspension