I bought a car Maruader 30 cc from Nitrotek and it broke down after my first tank. The diff on the car is not enough to handel the force and breaks down after one tank. I contacted support and after sending pictures of the car and diff they asked me to send the diff to them. I has no gone more then two month and I am stil waiting for my parts. I have asked and asked what happends and now they dont even write back. The diff is the same as on smaller cars and not up to the task also there is no such diff for sale on there site. Also the specifications on there site was wrong for the car as they didnt deliver with the controller as specified, they say they can change specification without any responsibility. Also there swedish support dont work and the swedish support/order number goes to someone who dont speak swedish or English. I now have a brand new car without parts and are waiting for any respons. Nitrotek is not reliable - dont buy from them is my advice.