ya the manual valve body is a good idea but most dont want to be shifting it all the time or they use a 5 or 6 speed tranny if they want full manual. alot of the guys say with the fast ecu it goes all weird if you jump on it to to pass a car and when it goes down shift then say let off the throttle it gets all confused and acts funny for a little bit. but i have no personal experience i can just go by the info ive read on line.