Hi Andrius,
The DEX210v2 comes as standard with the +8 Alloy chassis.
Full specs can be found at the kit page
http://www.team-durango.com/race-cars/dex210v2/
I have run mine indoors on carpet and it is very competitive straight out of the box.
You might want to try the geared diff in it on carpet and save the ball diff for more low grip surfaces.