Change your fuel filter.
Put in a fresh set of spark plugs. Just regular NGK ones will do, should be about 8 bucks a plug.
Change leads, dont worry about "6 or 7 core racing leads". Just regular NGK or Champion, or Topgun leads will do fine. Its not a 1500hp drag motor.
Run 100 octane, plus an octane booster.
Remove rear seats.
If the pod filter is just mounted where the airbox would go, get rid of it. Its just gonna suck up hot air. Get some plastic 3" pipe and run it from the throttle body down all the way to behind the front bar/infront of the front wheel. Either run the pod filter there, or dont run one at all, just stretch a stocking over it so that it doesnt suck up leaves etc.
Bleed the brakes, make sure your pedal feel is good.
Get a wheel alignment.

Most of this general maintenance stuff will help out a bit, as well as making sure you dont blow it up.

As for actual mods, how much money have you got to play with, because "cheap" can mean different things to different people.