<HTML>Chuck,
We use an air amplifier (2") in the exhaust of Bud Leutza's model 70 to help prevent "popping" when driving in stop and go traffic. Like Ron mentioned, a tiny bit of steam will get you an incredible airflow rate. Jerry Blain has made a number of (steam launch) burners using an air amplifier and an a steam atomising nozzle. The sky's the limit on the firing rate. I'm not sure how you could control that kind of burner on your car.
Many years ago I had Ed Haas make up some steel parts for some air amplifiers (because I was sure that the aluminium ones would melt in the exhaust gas stream) You are welcome to the bits if you would like to try to build your own.
Here'a website that has the air amplifiers that you are looking for.
[
www.exair.com]
Looks like you can get high temp ones also.
Have you thought about a locomotive type venturi in the stack and utilize the 4 cylinder exhaust ? And a raincoat too?
Dick</HTML>