Whats the best place to buy performance parts for a 2000 cherokee or any part for that matter?

Ok, heres what I've done to my 00' XJ. K&N FIPK, MAGNA FLOW MUFFLER, BOSCH PLATNUIM PLUGS. These have proven to up my power, and a little milage. Look into a mild lift to install 31's, 2"lift will fit 30's. Also look into JET chips, the stage 1. Good luck.