I use These:
http://cgi.ebay.com/Kyosho-Inferno-G...item35ad8509f4
I know they work great!

We do alot of high speed drifting/Drag racing Foams probably wouldnt hold up to my style of driving!
No Diff problems at all... Since February. The the 2650 even on 5s is a Handful. I only use 4s but gear higher... I would use 5s but I only have a Mamba Max right now....
This is my 8ight. Ill try and get some good pics of my dads and maybe vids this weekend