mods and cheap don't go together...
The cheapest way to make the car louder is a catless downpipe, but that will cause a CEL. By-itself with a CEL bypass module, or a JB4 tune added into the mix. You also need to realize if your state has emissions inspections , you need to swap it back to OEM cat to pass.
The proper HJS race cat downpipes will set you 1000+. Fabspeed muffler bypass is ~900, if you have a muffler shop near you, ask them about a muffler bypass and it should be < $300 according to members.
A resonator delete has been done by a few members on there own, it's just a piece of pipe and some clamps, muffler shop could perform the same task for short $. Other companies like Dinan have pre-made res deletes for $250 or so.
http://www.2addicts.com/forums/showthread.php?t=1296128
Good luck. Search the forum for these items and you will find stuff.