Originally posted by Section 8
He didn't say weather or not he was using managment or the stock computer. With good managment he will have no problems with US gas.
The STi ECU is good too... but that's irrelevant.
And J-specs aren't running up to 20 psi. stock.
Running an older STi engine with lower octane might yeild some huge problems with knock and whatnot.
Good luck though!