spark plug in tail pipe???

[deferr]

I have 2 ideas in order to make my 300d a little more fun to mess around in since I'm not gonna burn anybody off the line.

Idea 1 is the idea that some hot rods use. They wire a spark plug in the tail pipe and then unburnt fuel and hot exhaust gases ignite 'causing a flame to shoot out the back. I'm not so sure that with a diesel the same theory would work though. Anybody have any educated comments??

Idea 2 set up an injector in the exhaust manifold hooked up to a swith in the car. Then when someone is tailing me I just push the button which releases straight diesel into my hot exhaust creating lots of black smoke and hereby sending a message. Anybody know how this may work?