For another brand of replica, CMS is probably ok, but once you are producing Cobras CMS is waaay too close to CMC (!). I would strongly advise avoiding any potential confusion or mistaken cross reference with that infamous marque! If Chestnut Motor Sports is already your registered business name, then avoid the abbreviated version when marketing the Cobra.
Some quick suggestions:
CSS - Chestnut Super Snake
CTR - Chestnut Thoroughbred Roadster
C65R- Chestnut 65 Roadster
Another moniker to avoid:
Chestnut
Racing
And
Performance
Products
Extreme
Roadster
Edit: Wait - hold on, now - that may not be so bad. Here's the tagline:
"OUR NEW ROADSTER'S PERFORMANCE IS SO EXTREME, YOU
WILL SOIL YOUR BOXERS - AND WHAT BETTER PLACE TO BE WHEN THAT HAPPENS, THAN IN THE
C.R.A.P.P.E.R.!!"