hmm, only way I can see you getting it up that high that cheap is nitrous. (probably atleast a 100shot)
which I wouldnt recommend.
Now another 2grand or so and you could consider putting a supercharger on it, but pretty much no matter what your going to want intake/exhaust done. (at least optimize y-pipe, headers, etc.)
theres a fair bit you can do cheaply/for nothing, (gut precats, y-pipe, intake/heatshield, throttlebody, clean intake manifolds, etc.) but don't see anyhting that is going to net you a solid 150hp (at the wheels) short of n2o for that price.