cheap performance mods

[nuezdaman44]

Im not doin so well with cash right now and Im tryin to race my boys altima SE-R this weekend... Right now Im thinkin I have no chance, for one I have a MT and his is AT, and for two SE-Rs are pretty damn fast

What are some cheap or even free things I could do to stand a chance?

So far I have ebay headers and muffler on there, an intake I got from a junkyard, and I completely stripped out everything behind the drivers seat (no seats, seat belts or padding, its BARE) I also made a little air scoop which believe it or not actually helped a little bit. Im also getting a high flow cat and that little chip that u put on ur intake sensor...

Im rapidly approaching 100k miles maybe I should get new spark plugs?? Im pretty sure carmax changed them at 71k before I bought it.. who knows though

Anyways thx for ur help