I have a b18c, and i know there are a **** load of forums about ctr pistons in a gsr, but i jsut wanted to get this straight, i understand it will work, but my question is, will i have to do any work to the block, or can i just take my p72's out, and put in a NEW(meaning original size, no wear) set of the ctr's. also, i have a set of itr cams, is the ctr intake cam bigger, and make more power than the itr, if so i am going to run itr exhaust, and ctr intake. thanks