The H22 is the strongest however it's too big and it requires alot of modification. The B18C1 is cool and all however it's not as tough as the B18C5. I suggest the B18c5 perfect fit. Or better yet just get a B16A head and put it on your and you'd be faster then a type R. this process is called the LSR or LS VTEC. But the down side to it is that it can't be used for daily driving and if you want it to run right you need to take it to the shop. Cost only like a few hundred dollars.