Ironically, the srt throttle body and spacer combined is the same length as the stock 2.0 throttle body. Unfortunately the srt throttle body tapers down to 52mm at the plate and then dumps back up to 55mm at the spacer. Of course, the only solution to this is to have the throttle body itself ported to 55mm and a new plate added. I will not mention who did the porting. I waited over a month and gave them two throttle bodies, one as a core and one to port. It took them over a month to get one back to me. Their service was not great and to be honest, i do not feel it's a good idea to advertise their service.
The Key is the throttle body spacer. The outlet to the spacer is just too large to be held down by a coupler. The outlet is milled down to a traditional lip. There is also a small amount of material drilled out of the spacer to allow a set of nuts to hold the assembly together while giving clearance for a coupler. My spacer also has some areas shaved as a lame attempt to reduce weight. Pay no attention to those.
Tests should start tomorrow. I post my findings in the next couple of days.
The bolts are the stock throttle body bolts. Since they are not attaching to an intake manifold, they have been cut to length and i simply found a set of lock nuts to match at the local hardware store.
side view of the spacer
Face view of the spacer. I accidentally ported my spacer a little too much. It's almost 60mm. I'm actively looking for another one; I would rather have a true 55mm all the way around.
Face view of the throttle body. Notice that i also took out the torx set screw for the throttle idle and put a traditional bolt there. I occasionally suffer from idle undershoot.
Example of the throttle body side assembled with sensors.
Fully assembled throttle body.
