One of FA20 claimed "traits" vs old EJ engines was increased efficiency .. partially gained by shaving any excess material wherever possible .. obviously that adds limitations when you want to boost to higher levels. Otherwise i'd say that FA20 is producing power & torque remarkably well for current stricter and stricter emission requirements. There is reason why most vendors (supercar makers excluded) giving up making high specific output NA engines, including traditionally among best NA 4-cyl engine makers, Honda. Latest gen civic type-r engine in my eyes marked end of NA era most. "If even they gave up"..