Okay I got the lowdown from GSRich on Autocom systems. Here is what he said;
Our older systems form around 5 or so years ago run 5 pin headsets and our
later systems run 7 pins increase the headset volume levels by around 300% due
to running independent earths on the speakers. Although the headsets have
changed the bike to bike connections all still run via 5 pin connections. So
PTT will be our Parts 1457 is they are our older Pro M1's or Eurocom's etc.
In-ear speakers will run via our Parts 1187 or 1188 on our 7 pin systems or a
Part 27 £25 on the older 5 pin systems all depending on the models.
The GPS's all run different connections so for this I will need to know models
of the GPS and the full correct name of the intercoms being used.
Kenwood wise we have not sold the Part 100's etc for the last 5 or so years
they have been replaced with the Part 102's for the older Kenwood TK3101's,
they are NOT suitable for the TK3201 though. The leads are quite short so our
Part 1512's would be needed per bike to extend the transceivers out, but if you
are running the Kenwoods up to the front of the bikes two leads might be needed
per bike.
On the radios, the Alan can run via part 1434 £17, the Wintec via a special
build interface lead costing £35.
Different brand comms can talk to each other as they would run via the
transceivers, so once all the channels have been set away you go. The only real
thing you will find is how clear the radios are due to the different brands of
headsets and transceivers.!!!
Me again;
So a few pointers. Things like the Kenwood are about #120 quid each. because these are better systems then you should get better preformance. The thing is how ofter will you actually use the system? Can you justify the expense? Something like the alan may be good enough. I am going to try to get some info on them from people and will come back and post.
Speakers. Personally I have never been able to get on with the autocom speakers at all. I have now got some shuer E220s I think they are. These are in ear speakers that act as earplugs and the sound goes straight to your ear because they fit so deep into your ear. I have used them with my mp3 player and they are freaking fantistic. But horses for courses or curses depending on if it works or not.
Its a good system, but all the leads and connections 1 year on from BMW fitting it, I finally have, all the additional (nickle and dimed £££) leads and its all working ! Then managed to induce noise from the cable routing 
.
