i've seen a b18 buildup dropping 522whp @ 22psi, but they built that engine into a beast so it's definately worth it if u do it right....im planning on just rebuilding and boosting my lil F23A1 (the little engine that could) to make at least 400hp, that's my goal.... i just want jaws to drop when i start dusting mustangs in my 4 door family sedan...and that power will help out on the autocross course where i really do my damage