I recently found out the rings on one of my pistons is fried. So I am planning on replacing all of the pistons. I'm going n/a on this one and it's my weekend driver. I'm probably going to go with a higher displacement. I've heard the ITR and CTR pistons require slight mods to go on the b18b rods. I don't want to add the cost of machine work and I want to spend no more than $500. I'm using the stock rods (I have a set of new ones with new wrist pins) I have the basic I/E/H and a FPR. After this i'm getting a wide-band so I can tune my self. I'm looking to run 93 oct. in it. What's the most bang for the buck with out bending my valves?