Associated NTC3 if your willing to put down some good money for a good car. Iv raced RS4s and simular cars but have always found the NTC3 to come out on top, so iv been racing them for 3 years now. They can be pricey but you get what you pay for. Also, you know something is being half-a**ed when you try to make a touring car on a truggy chassis (HPI RS4).