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Stage 4 - (Approximately 400 H.P.) Please note, all power outputs stated are only approximations, for reference purposes and will vary depending on each vehicle, its condition, fuel and modifications.

**Stage 4 - Contains:

  1. AccessPort ECU Upgrade: The Accessport is a mult-featured ECU reprogramming device for your Subaru WRX or STi. The Accessport comes loaded with multiple maps for various setups (i.e. stock, turboback exhaust, etc.). It also allows for custom tuning through Tuners or self-tuning by downloading Cobb's Racer Tuner program. Your Subaru can easily be returned to stock at any time, as the Accessport retains your stock base map. In addition, the Accesport functions as a scan tool, diagnosing and clearing check engine lights (CELs) and other vehicle parameters. The Accessport's color display allows the user to display a variety of parameters including dynamometer testing and real time data.
  2. FREE MOD: Remove the stock resonator chamber in the passenger side front wheel well
  3. Short Ram Intake: Using the same design feature of the velocity stack found on the inlet to the MAF sensor in the factory box this cast aluminum intake carries the velocity stack radius outward to mate up with a 4.5" high flow cone filter.
  4. Blow Off Valve
  5. Custom 4 into 1 Stainless Steel Header and Uppipe Combo: Designed to significantly gain horsepower and torque.
  6. Turbo-Back Exhaust System with Cat
  7. Large Front Mount Intercooler - Intercooler kit: Front Mount Intercooler Core, Front Bumper Support Beam. Intercooler Piping Kit, T- bolt Clamps, Radiator Overflow Bottle, and Fuel Line Hose
  8. Custom GT30r (hi-flow) turbocharger
  9. Subaru STi Fuel Injectors
  10. 255cc Large Volume Fuel Pump

ECU Upgrade

Short Ram



High Output 255 liter fuel pump

Remove This



Large Front Mount Intercooler



Blow Off Valve



STi Fuel Injectors


Custom Turbo

Custom 4 into 1 Stainless Steel Header and Uppipe




Downpipe with Super High Flow Cat


Mellow Cat-Back


NOTE: Under Federal EPA regulation, replacement of original catalytic converters is allowed only if the original converter(s) is missing, or the vehicle has more than 50,000 miles or is at least five years old and the need for a replacement has been established and documented, or a local inspection program has determined the existing converter is in need of replacement. Please note that no aftermarket catalytic converters are legal for installation in California on OBD II vehicles (some 1994 & 1995, and all 1996 and later vehicles). There is a chance of seeing a CE Light: Inefficient cat code when running less than two cats, so if seen, contact us for the mechanical fix (sold separately). All performance parts have been designed and are intended for off highway application only. Installation of these parts on a vehicle intended for use on public roads may violate state or federal laws and regulations including those relating to emissions requirements and motor vehicle safety standards.

'02+ WRX Stage 4 - complete $11,600.00 + shipping Order Now!

**Note: Xcceleration.com highly recommends you install a boost gauge, exhaust gas temperature (EGT) gauge, air/fuel gauge and a knock sensor to monitor your car and ensure safe, reliable performance. Gauges are sold separately - Please appreciate, we just think that if you spent ~$25k+ on a high performance car like the WRX and even more $ to make it perform even better, you should seriously consider spending a few hundred $ additional to monitor some key parameters!

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