The B5, B6 and Banito are all pretty great engines in stock form though. The P5 never really was a "WOW" engine up until you got your hands on it. I would not hesitate to run any of the Werks engines or the Banito in stock form but I would hesitate on the P5. IMO you took a $200 so-so engine and doubled its value. May be my new favorite out of all the choices.