im not difuser, but i have driven the car, probably as much as anybody else, and on a real race track that is both prepared and green. the car would be good for an endurance race because it is durable. as i stated before we have done 15 min mains with our f1's which have 21.5 motors. i ran a 4000mah battery and still had plenty of mah left to run more. I dont think a battery change is necessary because of how long it would take to remove from the car. if you run the batt in the rear you need to remove the six top deck screws to get the batt out, and that could be a pain especially in a rush. tire wear is very low so no problems there