First lets start by opening the hood and seeing whats in there. The stock airbox sits up in the front nose of the car with a MAF immediatly after it. Then there's an oddly shaped duct called the "air bridge" which gets the air over the radiator shroud (clearance between the shroud and hood was minimal, so GM made this squished down bridge). The air bridge will have a sensor in it on non-LS6 cars called the IAT (Intake Air Temperature) sensor. On LS6 cars this sensor is built into the maf. The air bridge is then coupled to the throttle body with a black accordian looking tube, however, in the picture shown you can see the owner has replaced that piece with a silicon coupler.