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  1. 2.5 Liter/Litre Factory Motor
    hi all, i recently bought a 2018 sti with 26000 miles on it that had a gfb mach 2 recirculating valve and that was it at first. took it for a test drive and only could hit 9psi max and it was a struggle (this was in all si modes). after further inspection of the engine bay i noticed the car was...
  2. Built Motor Discussion
    I have a 2012 Subaru sti with a Tomioka 3076R turbo and my car has been running great until I noticed it was only hitting 13-14 psi of boost, tuned for 22psi the car has no boost leaks holds 20psi of air and smoke tested, all vacuum lines have tested and have no leaks, bypass valve is sealing...
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