Yeah, that 6XL might be a tad much for the MM in a truck. The review that RC driver (I think) did had their Revo doing close to 50 with an 8L. I suppose that the 6XL is going to be close in terms of kv rating, but it will pull more amps. If you gotta run something that hot, maybe the MM isn't your best choice. If I were putting a Revo together, it would have either an 8XL or 9XL in it. For that matter, a 10XL and run more cells. I think you should take a good look at the Quark controller.