I havnt made it to her exhaust issues, however I have changed the plugs (motocraft), Wires (taylor thundervolt), K&N filter, disassembled and cleaned the MAF, and just this morning got the keyless entry on the door working and reprogrammed. My tip, if you break the giant plastic push pin clips that hold the cover to the keyless entry module in the truck while getting the factory codes, some black rubber corks replace them perfectly and are far easier to remove later I didn't realize the "push pins" actually swivel and the cover comes off them until I broke them, opps.