[skellyo]

If you mean serious overkill as in spent more money than was necessary and have more power than is even remotely possible to use, sure, it'll be that. You have to remember that the Slash is a 2WD vehicle and traction will be a huge limitation with the vehicle. I highly suggest sticking with something like a 4600 or 5700 combo in order to maintain a decent level of drivability.