I didnt even need to look up your VIN. First of all, the real M5 has a S where your D is. It is also not a 1978 M car. Completely wrong VIN. So, just to set the record straight... There is NO SUCH car as a M5.33 That is plain silly. You are obviously not reading any of the posts from people. You are in the Philly Area just going by your IP address. You should meet with Rich in Philly or Joe In NJ (He is as close to Philly as it gets). If your mechanic says you have a M5.33, let him know he is an idiot. As a matter of fact, give me his number. I will let him know.