Which motor do you have, and what exactly do you mean by replace the stock chip with a performance chip.
If you mean getting a tuned PCM/TCM then get a WAMS and swap em out.
If you're looking at plug in chips like the jet performance chip, it's really not worth it. Although they may make a difference you're bound to run into problems with it down the road. It's not a really good long term solution. A tune however is perfect.
If you have the 4cyl and you put an intake on it you will need to get it tuned.