id remove the rear bumper, most as Dan said don't bother with it.

don't expect much of the new gt12 to fit, its very different, in fact only the front beam/hubs will fit the older car along with the rear diff. lipo tray, rear pod and plates are all different.

Yeah, I thought the diffuser would probably be more of a visual/detail thing than functional, i'll have to look at ordering one soon to replace the rear bumper :)

Looking at my list, most of the GT bits I want to get are for the front end suspension, so hopefully there won't be too many compatibility issues.

I'm guessing most people race with the sensored motor/esc system too?

Yeh dont think there are many senorless systems homlogated

yep. that be me i reckon you refering too .:)

Does anyone know the tyre rating of the kit tyres in the new gt12 kits?

On the back of the box

So it is couldnt see it for looking, must of read through the Manuela 10+ times looking for it.
Thanks