with my experience a 1515 2.5d on 6s is stupid, so I can only assume a 1515 1y on 6s is stupider ( More Stupid )! 1515 2.5d on 5s is still insane yet driveable! Does your friend want to actually use this truck or just break it? MMM combo on a good pair of 2s Lipo, tires to match the terrain your running on, and just run it! When something breaks then you upgrade that part! Everyone's driving style is different so everyone breaks different parts. No matter how much power you put in an E-REVO it's all a waste if you can't drive it! Wheelies get old fast in my opinion. So I suggest not going for the most insane setup but instead going for something that is actually driveable, even if money isn't an object! In the perfect world I'd have the MMM combo in mine and 3-4 sets of enerland based 2s Lipos for it!