I am awaiting a Forge BPV from Street Unit and I have some questions before I get it. I've read numerous places about springs, what is the deal with those? The color I hear used most often is the blue spring, any confirmation or experiences with other colors? Also is there any way that a leaking stock BPV can cause the car to run rich between shifts? I'm just looking to get ready so when the part comes I'll be ready for a quick install.