The trouble with most of the commercially available 2wd cars is that they just fall apart. They're just not up to racing on the tracks we race on, ask me how I know
Scotts little Mini T conversion at the Micro X went really well, and was easily as fast as the Chunks, maybe a little less consistent but just as fast. But even his car suffered with parts failure I believe.
We do have some Chunk kits available for sale, but not many, and with the grief I've had getting parts made it will never be many !!!
If anyone is interested get in touch ....
What we really need is for a big manufacturer to make one ....