Realized that I never posted an intro. Bought a 07 AT that has a TRD cat back exhaust already with everything else stock. Want bigger rims, tires and 2.5 to 3" lift, supercharger, better front bumper and under armor eventually. Just bought an Airaid CAI based on what another person posted on these forums. Thinking that I gotta get an upgraded exhaust from the manifold to mate up with the TRD cat back exhaust because I have a hole in my catalytic converter along with a trouble code for the catalytic converter.