The Subaru WRX is a sporty sedan that’s been a regular fixture at rally events since its release in 1992. Originally developed as a turbocharged version of the Subaru Impreza, the automaker first adopted the WRX name for the fourth-generation release of this sedan in 2014. The fourth-generation WRX brings various performance and styling upgrades to the model and allows for exciting modifications for more personalization. This review compiles some of the best Subaru WRX and STI modifications to improve your car’s performance. Read on to discover which brands to consider for these upgrades.
Top Performance Upgrades for the Subaru WRX
Plenty of performance upgrades are available for later-model Subaru WRXs that you can leverage to improve performance and power output. Here are a few that are guaranteed to transform your WRX’s performance.
Cold Air Intake Systems
A cold air intake system is one of the most straightforward ways to boost your WRX’s performance. This modification allows more airflow into the engine, increasing horsepower and torque. Popular brands such as COBB and AEM offer reliable options that improve performance and create a more aggressive engine sound.
Exhaust System Upgrades
Upgrading your WRX’s exhaust system can significantly improve its horsepower and torque and make its engine exhaust sound sportier and more aggressive. There are three types of exhaust systems: cat-back, axle-back, and turbo-back exhausts. Each offers different levels of performance gains and sound characteristics. At John Kennedy Subaru of Plymouth in Pennsylvania, we recommend cat-back exhaust systems for new Subaru models, as they provide the optimal balance of performance and sound.
Coilovers
Coilovers provide height adjustment, improved handling characteristics, and adjustable damping that can strengthen your WRX’s cornering ability while giving it a more aggressive stance. Brands such as KW, TEIN, and BC Racing offer quality suspension solutions.
Turbo and Intercooler Enhancements
Upgrading your turbocharger and intercooler system can significantly increase your WRX’s power output. Larger or more efficient intercoolers help reduce engine heat soak while improving the overall performance. Popular manufacturers for turbocharger upgrades include Garrett, Blouch Performance Turbo, and Forced Performance, while Mishimoto, Process West, and COBB provide high-quality intercooler systems.
Engine Control Unit Tuning
Engine control unit (ECU) tuning optimizes your WRX’s engine performance by adjusting fuel and ignition timing parameters. A proper ECU tune can significantly increase horsepower, torque, and throttle response. Reputable tuners such as COBB and APR offer proven solutions that improve the overall performance while potentially improving fuel efficiency.
Bigger Fuel Injectors
Upgrading to bigger fuel injectors is one of the simplest modifications you can perform to improve your WRX’s performance. Increasing the size of the fuel injectors adds more fuel to the fuel system, resulting in more combustion and greater power.
Performance Clutch
The Subaru WRX’s native clutch can handle the engine power comfortably. However, if you plan on upgrading to a more powerful high-output engine, you’ll need to upgrade to a performance clutch. Upfitting your WRX with a performance clutch can significantly enhance clutch engagement and shifting feel. Trusty brands that offer these modifications include South Bend, EXEDY, and ACT.
Improving Handling and Stability
While the Subaru WRX comes with capable handling from the factory, targeted upgrades can significantly improve its performance in corners and during high-speed maneuvers. Here are the best WRX modifications for better handling and stability.
Wheel, Tire, and Suspension Upgrades
Lighter, wider wheels from manufacturers such as Enkei and VOLK RACING, paired with high-performance tires from Michelin or Bridgestone, can dramatically improve your WRX’s handling characteristics. Adding sway bars and endlinks further reduces body roll and improves cornering stability. The right combination of these components creates a more responsive and controlled driving experience.
Brake Upgrades
While the Subaru WRX already has excellent brakes, upgrading to high-performance aftermarket parts for your WRX’s brake pads, calipers, and rotors can enhance its braking capabilities. Popular brands that offer these mods include StopTech and Brembo.
Steering Rack Upgrades
A steering rack upgrade is worth considering if you want better handling from your WRX STI. Upgrading your Subaru’s steering rack will enhance its steering response and make driving a lot more pleasant. This mod typically delivers the best results when paired with other performance mods such as coilovers.
Aesthetic Modifications With Performance Benefits
In addition to enhancing the car’s appearance, many visual modifications for the Subaru WRX also serve functional purposes. Here are some styling mods you can leverage to customize your WRX and upgrade its performance.
Aerodynamic Parts
The WRX’s aerodynamic improvements demonstrate the importance of proper air management. Aftermarket spoilers, diffusers, and body kits can further enhance these characteristics. Front and rear lips and side skirts give the car a more aggressive appearance and improve airflow management. Adding mudflaps protects against road debris while maintaining the WRX’s rally-inspired aesthetic.
Lighting Upgrades
LED headlights, taillights, and fog lights provide better visibility while giving your WRX or STI a modern appearance. These upgrades improve safety during night-time driving and give your sedan a distinctive look.
Window Tint Kits
Getting a window tint upgrade enhances your WRX’s appearance and reduces heat and glare. If you live in an area that experiences a hot climate for much of the year, getting window tint modifications can keep your car’s cabin cooler and protect the interior from UV damage. It’s worth noting that certain tint shades may not be legal in all states. So, if you’re considering this upgrade, confirm what window tint laws apply to your vehicle in your state.
Get Professional Subaru Installation Services at John Kennedy Subaru Plymouth
Professional installation is crucial when upgrading your Subaru WRX or STI with original equipment manufacturer or quality aftermarket performance parts. Getting experts to conduct your modifications ensures the components used are high quality and perfectly fit your vehicle.
If you’re looking for a professional to install the modifications discussed here, contact us at John Kennedy Subaru in Plymouth Meeting, Pennsylvania. Our certified Subaru service team is happy to help you find and install the right parts for your vehicle. If you’re interested in the latest sporty Subaru, such as the 2025 Subaru BRZ sedans, visit us for a free test-drive.
Connect with us
