Sorry about the late reply...basically any PB will work with the TP with the TP cable from Phatnoise...just be sure you have the right connector on the back...Becker/HK made a lot of custom-connector units for various auto-makers.
Once you have the cable, it's a simple matter of new firmware update.
I've used an original Red beta box, a LE, and an Audi/VW Phatbox with my TP 4773.