BMW M30 Big Bore Throttle Body E23 E24 E28 E32 E34

Up for auction is a powdercoated gloss black M30 big bore throttle body. The throttle has been bored out 3mm all the way around and trumpeted on the intake side. Also, one side of the butterfly arm has been cut out to increase flow and a new butterfly plate has been made to match the larger bore. All of these changes amount to a 14% increase in flow. I check every core for defects and make sure everything is working properly. The throttle body was stripped bare, sandblasted, and regreased before being put back together. I have one of these on my car and the difference is very noticeable. The power under the curve increases, the throttle response is greatly improved and the torque when driving at highway speeds goes from nonexistent to instantaneous. This is particularly enjoyable when you're passing slower cars. It will fit a variety of M30 engines so long as you have the one piece manifold. Older M30's had the runner and plenum style manifold which had a different type of throttle body. This means ... Read More