Ironically their ad is right below this thread. Their ad face page is oriented primarily towards electronic ignition engines, but if you follow the order process they do have a device for the E300td.

I remember many years ago when I was a kid I saw an ad for a turbine that attached to the backside of your differential ring gear. You would ignite the turbine and add force to the ring gear.

Wish I still had my old Hot Rod mags. Just looking at the ads would be fun.