I plan on upgrading my cams in my B16 (SiR2) with some CTR cams, and i plan up using JDM ITR valve springs, Is it ok to use my stock retainers, or use the JDM ITR retainers, or get some Ti retainers, I read somewhere on here that the later model B series retainers are all the same... my motor is from a 92 SiR2 EG by the way...