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For free, you can modify you crankshaft position sensor (CKP). Pull it off, slot the bolt holes so it slides towards the oil filter, and reinstall. I did this and noticed a little improvement on the bottom end.

A new intake may help also. I went with the old carberator style intake, a 14 inch round model for under $30. A K&N FIPK is more expensive but popular.

A programmer will run you a little more money, you might be able to pick one up used. They won't give you as much power as a Mopar Performance PCM, which are harder to find. But you have to run premium gas with the Mopar PCM.

There isn't a whole lot that you can do cheaply to improve power. But check out my signature. The mods I did cost less than $200 altogether, and I got a noticable increase in power.

Silver_Dodge has posted quite a bit on engine mods as well as RM Indy. Do a search by putting their names in the search function.