Raced mine for the first time today and im very happy to say that the B5 is a great mill. I ran a 2013 pipe and the AE pipe either one will do the job ended up running the 2013 for the main and pitted at 8 min. which this track is very hard to get good run times on. The lowend was second to none with an M2C 4 shoe clutch light shoes and 9.5 springs next time im going to try 9.0s . Everyone here is wanting to get one now.