I looked on msn.com and found out that the ex has 9.6:1 and the hx has 10.6:1 ratios (Don't know how reliable there source is). Would a mini-me swap be possible? I don't really know if the head and block will all line up correctly. But if they do it might be worth my while to spend a few green backs just to gain some hp, just for fun. Plus, with having higher compression ratio wouldn't that help hp, too? I'm not looking to race, just want that extra little grunt.