[Mike_D]

Nothing, the twin is built tough, here a list of things i have on it.

1)New Era 2 inch Double Extended Chassis

2)New Era Center Skid Plate

3)New Era Shock Mounting Kit

4)New Era Beefy Titanium Extended Center Dog Bones x 2

5)New Era Beefy Titanium Outer Axle Dog Bones x 4

6)New Era Stainless Steel Screw Set

7)Duratrax Thunder Quake Wheels x 2

8)Proline Masher 40 Series Tires x 2

9)Kyosho Upgraded Steel Ring and Pinion Gears for Front and Rear Differentials

10) Steering Linkage has been upgraded to 4mm threaded stainless steel rods with Traxxas Revo ball ends