So how much would an H22 swap cost and would you have to swap the transmission and/or anything else?

tranny is a good idea, as the gear ratios are better for acceleration. The h22 swap typically runs around $2300-2500 depending shipped, and there is certaintly a wealth of information out there. You may try my signature to help you out. Any questions you have I'd be happy to answer for you.

- Nathan

might wanna look into an LSD tranny, it will help better distribute the added power therefore benefiting your acceleration.