I have a 2002 XR650R with the B53E needle in position #3, 175 main and stock 65S pilot with an FMF Power Core 4 Squared pipe. It does not seem to have the same bottom end power that my buddie's 2000 has. He is running the 65S pilot, 175 main, the stock needle in position #4 with an R4 White Bros pipe. Could it be the pipe? Anyone have any experience with these pipes? Any suggestions?