What the heck are "smokepods"? ???

If you want to put smoke on ANY aircraft, all you have to do is copy the [smokesystem] section from the Extra 300's aircraft.cfg file into another one and tweak the positions.

For more on this, go check here:

http://www.simviation.com/fs2002misc9.htm

Second from the top.  It will tell you everything you might need to know about placing effects on an aircraft.