1/8 buggy problem

I would still go with the 2200 motor but it's your choice. I have used the 2650 motor in my RC8Be and it ran a lot hotter than the 2200. I tried it on 5S and it got very hot very quickly. I had to drop the gearing a lot to the point where the buggy started to feel slow again just to keep the temps of the motor down. With the 2200 motor I can gear it for higher speeds than the 2650, both on 5S, and it stays cooler. If you just want to go for speed runs then maybe the 2650 would be OK but thats not a setup that you can blast up and down the street all day long.