if you can find one, a b18c5 motor would be the best choice. it would be cheaper, however, to just get a gsr with the b18c1 already there. drop about 1,500 on the right engine mods, (no turbo) and you'll have type-r performance. only get an h22a if you plan on drag racing the thing, and don't plan on driving to work everyday, or on any winding mountain roads. that motor is fast, but doesn't fit quite right and is almost 150 pounds heavier than the b series, which will ---- up your wieght distribution, which in turn hits you with massive handling problems.