The 22/23 WRX's FA24F engine
The 22/23 WRX's FA24F engine is under-boosted from the factory but has been beefed up internally. A simple intake and exhaust upgrade with a mild tune will boost the horsepower by 50-70 HP. But I don't plan on doing that to my 22 WRX for at least a few years because it's so fun to drive as is.