Well, there are three types of 4Tecs.
Electic 4Tec, .15 engine Nitro 4Tec, and 2.5 Nitro 4Tec(fastest).
I know why many do not have this car.
It is because the 4Tec is hard to work on. But I don't believe them. Even if it is true, it is worth it if you're in the need for speed.
I also know cars that are faster than the 4Tec.
CEN ct4s goes 70+ miles per hour but be careful because I know a person who bumped his ct4s once and it was rammed. It became L-shaped.
The other fast car is the Novarossi which goes 90+miles per hour.
These cars are for DRAGS. And they can beat 1/5 scale r/c cars!!!