Parts
 

Whats the best place to still buy parts of the D4 (either in ther UK or USA) ? Can't seem to find much.

any shop with a HPI acount should be able to get them for you, but they may not hold much in stock as it is no longer a popular car.

I used to get all my bits through Microtech

What parts are you after, I have a load of spares for the D4!

The most obvious I guess are :
front shock tower
front gearbox cover
front arms
maybe hubs.

Thats what I think is most likely to break in case of a crash.
I placed an order at A Main in the US as I didn't find anything else. I would be nice to find parts closer.