Hey Folks, Hello from San Diego, CA. New to the site about four months ago but finally looking around to find some valuable info and maybe make some new friends. I have a 2000 538i wagon with M Power and not too sure what the E desinations mean and which is for my car and not sure of the horsepower for this particular model since this information is not found in the owner's manual. I am also looking for a diagnostic tool for the car since the service engine light likes to come on periodically and I am looking for the stock air cleaner/cold air intake tube, mine was replace with a K&N style and it is not pulling air from the stock intake. Is this OK? Does this increase or decrease horsepower? If any one has any insight on this I would be very glad for you help.