you may want to ask Josh C. at CEFX about that one. i beleive the first CEFX C-12 had a longer t-bar like that of a 1/10th pan car.
when i was recently building up the latest C-12 with AE front, i noticed the t-bar was shorter than a 12th AE t-bar and the rear pivot was farther back. i also noticed more holes for other t-bar lenghts. so i emailed and got this response:
The C12 rear pod is much longer than an AE pod to allow for a larger range
of gear selections. With the pivot moved back, this gets the geometry back
correct so we have the shorter pod geometry. We have the other holes so you can use AE t-bars or the CEFX short, med, long. The kit now comes with the medium. The longer t-bar reacts slower and is easier to drive but lacks steering and a quick change of direction. It is very good on high speed, flowing tracks or ones that are really bumpy. The medium has a similar feel to driving an AE car. The short is really quick and almost twitchy to drive. It was intended for asphalt racing where sometimes you need to run a very short t-bar to generate enough steering and quick responce on a slippery surface.