I used to be pretty heavy into touring cars. Raced asphalt in the summers and carpet during the cold months.
My first was a TC3 racer which I upgraded quite a bit to lose weight and stiffen the chassis.
Later I moved up to the Factory team and transferred whatever mods that made sense. That car felt much more substantial than the previous, but because of the mileage on the old Racer model, it felt like it rolled smoother. My track always ran stock motors, but I would keep a 13 turn in my backup car so that I could have fun in practice sessions.
I abandoned the hobby when I wan old enough to take my real car to the track.