Autozone.com has a promo code right now for 20% off. promo code: SEECLEAR
they don't have a very big selection of aftermarket performance parts but you can order and Airraid or K&N intake. also Flowmaster, Magnaflow, and Dynomax exhaust systems and axlebacks.
I just used to the code on the Dynomax kit for my 2012 V6
and it ended up being less than $295 after tax and shipping. pretty cheap I think. also I think the code expires soon so hurry!