The dealer is currently working on my car, and told me I needed to replace all piston rings. I have a JDM B18CR w/JRSC. Now,the rep is telling me that I might as well change my pistons, and if I were to, he suggested that I get USDM ITR pistons because it has a lower compression and that it would be better for my setup. Would it make a huge difference if I were to get USDM or JDM? Was also looking at these spoon balanced oem pistons...but not sure if they would be any better. Thanks.