Thank you sir, that was me! Having only done (full scale) club and national racing before this commentary, it was quite the adjustment trying to keep up with these crazy things!
FG Modelsport. You can buy complete ready to race from Daves Discount Motors. (USA) www.davesmotors.com/evo-2020-complete.html (UK) www.rapid-racing.co.uk/FG-Modellsport-Models/Cars/C74-1-0.htm
There are several manufacturers here. FG, H.A.R.M., Mechatec, and a few others escaping my mind right now. These giant scale vehicles can easily approach the price of a real car when you compete at this level.