I recently purchased a 935 Style flat fan for my 4.0L 964 motor. So now I can't use the factory intake or throttle body assembly. So I decided to go ITBs, coil on plug, and MS3Pro injection.
I found two sets of BMW K1300S Motorcycle throttle bodies that came like this:
I cut them apart into individual throttle bodies, removed the studs and tapped the stud holes to M6x1.0.
I already had a set of MFI throttle bodies that were so corroded that they could not be saved. So I removed the throttle shafts and linkage from the MFI throttle bodies. I opened the slots on the shafts, and the BMW throttle butterflies fit perfectly. I had to cut the end off the shaft from one of the BMW throttle bodies and weld it onto the MFI throttle body shaft so I had a TPS drive. I pressed the cross shaft bearings out of the plastic MFI stacks for reuse as well.
Using a sheet of plywood, I built a jig to hold the throttle bodies in place with the fan so I can build the linkage and wiring harness before tearing apart the current Motronic setup.
Some time spent with Fusion 360 and a purchase from Send Cut Send, and I now have this:
I still have to make the correct length linkage to go from the crossbar to the center throttle bodies. And to do that I have to buy a M5x0.8 left hand thread die. I considered drilling the throttle bodies for idle air bleed screws, but I can compensate for that with the MS3Pro programming.
This setup is going in my 914 chassis, so it will actually go in with the crossbar at the flywheel end of the motor. I am going to make a throttle cable mount that will attach to the 4-6 side throttle bodies so I can hook directly to the crossbar with no additional linkage.