4wd on carpet - What features to look for?

[jhock]

I am very seriously considering getting 4wd for racing indoors on carpet, I have a 2wd already and I think 80% of my racing will be indoors on carpet.

My local club in Watford has quite low grip (for carpet), so that might be worth considering when I look at what will suit me.

Most cars seem to come in 2 versions now.

So what should I look for?

Belt or shaft?
Slipper or centre diff?

I have not raced 4wd for a long time, the last car I had was a xx4, which I loved.

So why not get the 22-4 2.0? I understand there is no official importer for the UK so parts could be a real problem?

Any advice welcome!