the cen is way to old in design, they have the huge spur gear because of the drive system they use, to make the cen good you will have to spend a ton of money to make it as good as another truggy out there, i would suggest just picking up a used mugen mbx5t prospec, they are one of the most durable trucks you can get, then once the dust settles and all the companies have there new ones out get one, i wouldnt get the old jammin either it has that old style diff set up