So on a charity ride this weekend I heard a Harley that had a jake brake kit installed on it. I never got a chance to ask how he did it. I do know that it was a newer fuel injected Harley. Does anyone know if it can be done or how to put a jake brake on a 900 vulcan. I have a powerpro auto tuner. Anyway I could put a switch to the ground to shut off the injectors or would this harm the tuner?