I used Tams nozzle a couple of inches behind the exhaust cone, but well inside the tail pipe. great smoke, wiht SuperDri, however, it does leave a bit of an oily residue. The first couple of times we got oil inside the pipe when refilling the smoke tank (didn't know you had to pinch off the nozzle line) Fully expected a fire on start up but it just blew a puff of smoke out the back.

I don't think I would try diesel unless is was injected behind the tailpipe -externally. The Snowbirds were one team that tried coloured smoke for one year. The necessary chemicals were found to be extremely messy and somewhat toxic, so the concept was abandoned after that show season...