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    • TPG Tuning built 2005 Subaru STI EJ25 making 605 awhp on a Mustang dyno at 33 psi on E70 from a Garrett GTX35R

      Subaru did a great service to US enthusiasts when the WRX STI arrived on our shores with a 2.5 liter boxer four. Tuners immediately started to extract power and when the motor is built you can get some incredible numbers from the EJ.


      This is hardly a crazy example yet it is making power from 2.5 liters that would make most modern sports cars blush.

      How about 605 horsepower to all four wheels at 33 psi? On a Mustang dyno?


      Mod list:

      TPG Tuning Sleeved EJ25 Block
      TPG Tuning Stage 3 Heads
      IAG Performance 14mm Studs, Cooper Ring Gaskets, TGV Deletes, Fuel Rails
      Extreme Turbo Systems GTX35R RTK and FMIC
      Radium Dual 485lph Surge Tank Setup
      Injector Dynamics ID1300s
      COBB Tuning FF, MAP, EBCS, and V3 AP

      605whp at 33psi on E70
      451whp at 20psi on E10

      A very potent STI.

      This article was originally published in forum thread: TPG Tuning built 2005 Subaru STI EJ25 making 605 awhp on a Mustang dyno at 33 psi on E70 from a Garrett GTX35R started by Sticky View original post