i have drive both cars that teammagic have made in the e4 and found that the e4rs is a must have the car has unreal steering good rear end grip beaten the top guys race time by 6 sec in stock.i ran it 4 the first time in 540 and took out the summer cup then put it away then took it out agin to go very well in stock.you might find it hard tho to find places on the car to get it up to wieht when running lipo and the car has so much flex so you might have to sort out tweaks in the chassie but i think its a car on the rise to the top.some might say other wise tho