Hello. My name is Roger and a qualified automotive technician. 40 yrs working on a vast range of passenger, commercial and small engines. I drive a 2008 BMW 335i Motorsport wagon. I have eliminated every oil leak and I have fitted catless downpipes, upgrade charge pipe and run a JB4. I have spent many hours testing and learning the functions of JB4. Very little info is supplied and its a learn as you go. Can be frustrating, but have found it to be a good match for the BMW.
