3.8L 3800 Series II HV3 High Velocity Intake Plenum Insert 30hp gain 1997-03 L36

Takes 3-5 business days to ship.   1997-03 Pontiac Grand Prix 3800 3.8L, 1997-05 Buick Regal, 1996-2003 Pontiac Bonneville, 1996-2003 Buick Park Avenue, 2000-05 Chevy Impala and Monte Carlo, 1996+ Buick Lesabre, .  All with the L36 3.8L 3800 naturally aspirated engine.  We have another auction up for the 2004-07 Grand Prix with the aluminum upper intake.  This will fit the engines that have the black plastic upper intake plenum. The High Velocity Upper Intake Manifold Insert replaces the factory plastic runners in the upper intake manifold found in FWD Series II 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!  By changing the intake tuning we are able to achieve performance numbers previously unheard of in the L36. In short we gained 9 peak WHP and 30 WHP at 6000rpm.  When coupled with ER rockers and our HV TB the performance surpasses dyno #'s of cam'd