What will it cost to install an performance air filter?

If it is the filter only this is a DIY project. A good filter like K&N will run somewhere around $50. If you get into a cold air intake system you could be looking at almost $200 just for parts not to mention you may have to do some modification under the hood to make it fit, if your not comfortable doing this you can pay a mechanic and that may run another $100 or so.