After a quick little google search ive seen stock b18c1s make about 170 and stock h22a's make around 190. Thats whp. I know JDM gsr swaps can be had with an OEM LSD trans, not sure about the h22. just some more info. I dont know much heavier the h22 is compared to a b18c1. Too many variables really man. If you want to not go the traditional route and swap a b series in there, get the h22! If you dont want to deal with an h series, get the B! Its pretty much all up to you man.