Spoke to Tony Rullo about these at the Nats on Saturday. Thanks Tony, you are a legend! :banghead: Boost box sits on the side of your battery box, it ups the PSI to about 8 or 9 I believe, and also fools the computer to think the car is still running factory boost. NINKA runs one of these I think, havent heard from him in a long time though. Rising rate regulator sounds like a fuel pressure regulator, as the boost increases, it adjusts the fuel pressure accordingly. CAPA products are very good, remember Street Tuner is involved with CAPA's R&D.