[Overdriven]

Love the build so far, can't wait to see it come together.

Bigger is always better when it comes to motors. But the 1515 1y is a versatile motor, try it out and see if it suits your needs. It'll depend alot on your gearing, how fast you want to go and driving style. The longer cc 1518 and 1520 with their lower Kv and higher torque are more suited to 6s use and heavier trucks compared to the 1515 though. But you may have trouble fitting a longer motor in your setup without hitting the esc though. Have you run any numbers in any gear calcs?

Edit: I just ran some numbers based on your buggy ratio diffs, 46t spur, 2200kv and 6s. With 5.8 inch diameter tires and 8t pinion you'll be at 45mph without tire ballooning. Personally, I'd run a larger spur and possibly a lower kv motor to open up some gearing options, especially if you want to run larger tires. Pinions that small tend to wear quicker too. Can't hurt to try out what you have on hand either though.