Collection: Subaru WRX / STI Powertrain

The Subaru WRX STI is an iconic performance sedan known for its rally-inspired design and exhilarating driving experience. To enhance the already impressive capabilities of the WRX STI, enthusiasts often turn to a variety of engine upgrades and performance parts, transforming this sports car into a high-powered machine. Here's a detailed description of some popular Subaru WRX STI engine upgrades and parts:

1. Turbocharger Upgrades:

• Enthusiasts often opt for aftermarket turbochargers to increase the WRX STI's horsepower and torque. Upgraded turbochargers enhance boost levels and improve overall engine efficiency, delivering a significant bump in performance.

2. Exhaust Systems:

• Upgrading the exhaust system is a common modification to enhance both the sound and performance of the WRX STI. Aftermarket cat-back exhaust systems, featuring larger diameter pipes and high-flow mufflers, not only provide a more aggressive tone but also reduce exhaust restriction, allowing the engine to breathe more freely.

3. Cold Air Intake Systems:

• Cold air intake systems replace the stock air filter and intake components with high-flow, performance-oriented counterparts. By bringing in cooler air, these systems improve combustion efficiency, resulting in increased horsepower and throttle response.

4. Engine Management Systems:

• Aftermarket engine management systems allow for fine-tuning of the WRX STI's performance parameters. This includes adjustments to fuel injection, ignition timing, and boost levels, optimizing the engine for the specific upgrades installed. This ensures proper calibration and maximizes power gains.

5. Intercooler Upgrades:

• Upgrading the intercooler is crucial for maintaining consistent and lower intake air temperatures. Aftermarket intercoolers with larger surface areas and improved cooling efficiency help prevent heat soak, which can occur during spirited driving, and contribute to better overall engine performance.

6. Performance Headers:

• High-performance headers replace the stock exhaust manifold, improving exhaust flow and scavenging. This modification enhances the WRX STI's power delivery, particularly in the mid-to-high RPM range, resulting in a more responsive and powerful driving experience.

7. Upgraded Fuel System:

• As engine power increases, ensuring an adequate fuel supply becomes essential. Upgrading the fuel system, including injectors and fuel pumps, allows the WRX STI to handle the increased demand for fuel, supporting higher horsepower levels and maintaining optimal air-fuel ratios.

8. Performance Camshafts:

• Aftermarket camshafts are designed to optimize valve timing and lift, enhancing the WRX STI's performance across the entire RPM range. This modification can result in improved horsepower and torque, especially at higher engine speeds.

Enthusiasts can mix and match these upgrades based on their performance goals and driving preferences, creating a customized Subaru WRX STI that delivers an exhilarating and personalized driving experience.