Give us a break! The forum is littered with info about these cars...but I will tell you that the only ones that are worth a toss are the ones that start with Hyper. The inferno sport is a total pile of crap. Arguably the worst RTR in existence. I've seen one first hand. I don't think hte XTM is bad quality, but I dare say that the Hyper 7 is better, and the Hyper 8 better still.