This is the intake manifold used on the 2001-2004 Z06 Corvette LS1 engines. It has an increased plenum volume for more airflow to handle the power requirements of the LS6 engine. The manifold is supplied with the intake manifold seal P/N 12560251, gasket P/N 12533587, throttle body seal P/N 12552542, MAP sensor P/N 16212460, and MAP sensor seal P/N 16194007. You will need a new cross-over water pipe (12602544) and 2 plugs (12602540) to convert a "97-00" LS1 to the new LS6 intake.