KT 280BHP from the Subaru and EVO is plenty, this stupid oil change thing says that if you do an oil change and run the motor in you will get 40 BHP extra or more, which in real life is total BS, a car engine cannot build more BHP then what its built for, running an egine in is to make sure everything is balanced right, allows rings, grommets and seals to expand and cont rapt and embed their own groove, it might be worth up to 4BHP, oil changes are obviously needed as oil gets filled with iron filings and assorted other bits from intake, which will eventually sap power, but if it takes more then 40BHP then its going to blow up your engine,
280 BHP is what the 2006 impreza STI developed at the flywheel, so its pretty production like to limit it to that,
I just wish the category was limited to 1990-2008, then the Celica GT four, Delta HF, 22B, and other assorted AWD cars would be allowed,