Building a 400 Hp Va Wrx: Essential Upgrades from Intake to Exhaust

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The Subaru WRX is a beloved performance vehicle known for its rally heritage and all-wheel-drive capabilities. For enthusiasts looking to push their VA WRX to 400 horsepower, a series of essential upgrades are necessary, spanning from the intake system to the exhaust. This article will guide you through these upgrades, helping you maximize your vehicle’s performance.

Understanding the VA WRX Platform

The VA WRX, introduced in 2015, features a turbocharged 2.0L flat-four engine, which provides a solid foundation for tuning. However, to reach the 400 hp mark, you will need to enhance various components of the vehicle.

Essential Upgrades for 400 HP

1. Intake System

The intake system is crucial for improving airflow to the engine. Upgrading to a high-performance intake can significantly increase power and throttle response.

  • Cold Air Intake: Increases airflow and reduces intake temperatures.
  • High-Flow Air Filter: Improves filtration while allowing more air to pass.

2. Turbocharger Upgrade

The stock turbocharger can limit power potential. Upgrading to a larger turbo can help achieve the desired horsepower.

  • Aftermarket Turbo: Consider options like the Garrett GTX or ETS turbo.
  • Turbo Blanket: Reduces heat loss and improves efficiency.

3. Intercooler System

A larger intercooler helps cool the intake air, preventing heat soak and improving performance.

  • Front-Mount Intercooler: Provides better cooling than stock options.
  • Intercooler Piping: Upgrade to larger diameter pipes to reduce restrictions.

4. Fuel System Upgrades

To support higher horsepower, the fuel system must be able to deliver more fuel efficiently.

  • High-Flow Fuel Injectors: Necessary for increased fuel delivery.
  • Upgraded Fuel Pump: Ensures consistent fuel pressure under high load.

5. Engine Management System

A proper engine management system is vital for tuning the engine to handle increased power and ensure reliability.

  • ECU Tune: A custom tune will optimize performance for new modifications.
  • Accessport or Tuning Software: Essential for adjusting parameters.

6. Exhaust System

The exhaust system plays a critical role in reducing back pressure and improving exhaust flow.

  • Cat-Back Exhaust: Enhances sound and performance.
  • High-Flow Downpipe: Reduces restrictions and improves turbo spool.

7. Suspension and Tires

With increased power, the handling and grip of the vehicle must also be addressed.

  • Upgraded Coilovers: Improve handling and ride quality.
  • Performance Tires: Essential for maximizing grip during acceleration.

Conclusion

Building a 400 hp VA WRX requires careful consideration of each component from intake to exhaust. By following these essential upgrades, you will create a powerful and reliable performance vehicle that can handle the demands of the road and track. Always remember to consult with professionals and consider the implications of tuning your vehicle for high performance.