i would go gsr all day long, but if you do choose the h22, make sure to get the adapter to run a b series tranny. h22 tranny's are ftl. your thread title should be H2b vs B18c. cuz thats the only real comparison IMO. If you plan to heavily modify the engine for NA use, then the h22 may be for you. if boost is in the equation, take the gsr.