3.8L 3800 HV4 High Velocity Intake Plenum Insert 30hp gain 04+ L26 Aluminum intake

Takes 3-5 business days to ship.   All with the L26 3.8L 3800 naturally aspirated engine,  2004-07 Grand Prix with the aluminum upper intake.   The High Velocity Upper Intake Manifold Insert replaces the factory plastic runners in the upper intake manifold found in FWD  3800's.  Simply remove the upper intake (leaving the throttle body attached), pull out the stock runners, set the HV insert in the intake and bolt it back down! 30HP in 30 minutes!  More reliable - The HV4 does not require RTV, cannot be seen by anyone looking at your external engine, and it comes with a new intake gasket. Installing the new HV4 actually improves the reliability of your car by replacing a potentially worn out gasket. Because it sits entirely inside the intake, there are zero sealing issues.Does not work on factory GTPs or L67s or F-body. FWD L26 only Does NOT work for the supercharged engines.  This is the biggest horsepower gain for the money for all naturally aspirated 3800 Series  L26 engines with t