With out spending a lot of money is a tough one. Depends on your idea of "a lot" is. I would suggest looking on Craigslist in your area and poking around the for sale forums here. There is a lot of guys selling there stuff for cheap.
But a good way to start would be up/down pipe. Catless of course and your exhaust. I know a lot of people like doing the turbo back.
Do the easy free mods like your snorkus delete, makes your turbo sound awesome and in my opinion frees up a lot of space in your engine compartment.
If you have a local tuner after you get some of your mods done take it to them or buy a COBB access port.
Doing all your pipes you should be able to get the stage 2 map and be around 280ish.
There are a lot more guys that know more than I do on here but that is my 2 cents. Hope it helped some.