The K&N 77-3031KP high-flow performance air intake system is a free-flowing, mandrel-bent aluminum tube air induction system designed to fit some GMC Sierra 2500 HD or 3500 or Chevrolet Silverado 2500 HD or3500 models. The restrictive factory air filter and air intake housing on your vehicle are replaced by this K&N air intake system which is designed to dramatically reduce air flow restriction as it smoothes and straightens air flow. The improved air flow allows your engine to inhale a larger amount of air than it would from the stock air intake. More air means more usable power and acceleration throughout your engine's RPM range. The 77-3031KP air intake comes with a chrome topped K&N high-flow air filter and a heat shield that installs into the previous air box space. Air is directed through the intake tube into the engine's throttle body for a guaranteed power gain. The intake tube has an attractive chrome-like finish that's made to last and it accommodates the factory mass air sensor. The oversized cone shaped air filter can be used for up to 100,000 miles before servicing is needed depending on driving conditions. This air intake is relatively easy to install usually in 90 minutes or less using existing factory mounting points. The tools needed are a couple of screwdrivers, pliers, a ratchet set and several wrenches. Some K&N 77 series air intakes are not legal for sale or use in California and other states adopting California emission standards while others are CARB exempt and 50 state legal. Check the K&N catalog or website for vehicle applications and specific CARB status for each vehicle and air intake.

Vehicle Fitment

Years	Make	Model	Trim
2001–2005	Chevrolet	Silverado 2500 HD	Base
2001–2006	Chevrolet	Silverado 2500 HD	LS
2001–2006	Chevrolet	Silverado 2500 HD	LT
2003–2006	Chevrolet	Silverado 2500 HD	WT
2007	Chevrolet	Silverado 2500 HD Classic	LS
2007	Chevrolet	Silverado 2500 HD Classic	LT
2007	Chevrolet	Silverado 2500 HD Classic	WT
2001–2005	Chevrolet	Silverado 3500	Base
2001–2006	Chevrolet	Silverado 3500	LS
2001–2006	Chevrolet	Silverado 3500	LT
2004, 2006	Chevrolet	Silverado 3500	WT
2007	Chevrolet	Silverado 3500 Classic	LS
2007	Chevrolet	Silverado 3500 Classic	LT
2007	Chevrolet	Silverado 3500 Classic	WT
2002–2005	GMC	Sierra 2500 HD	Base
2001–2002, 2006	GMC	Sierra 2500 HD	SL
2001–2006	GMC	Sierra 2500 HD	SLE
2001–2006	GMC	Sierra 2500 HD	SLT
2003–2006	GMC	Sierra 2500 HD	WT
2007	GMC	Sierra 2500 HD Classic	SL
2007	GMC	Sierra 2500 HD Classic	SLE
2007	GMC	Sierra 2500 HD Classic	SLT
2007	GMC	Sierra 2500 HD Classic	WT
2002–2005	GMC	Sierra 3500	Base
2001–2002, 2006	GMC	Sierra 3500	SL
2001–2006	GMC	Sierra 3500	SLE
2001–2006	GMC	Sierra 3500	SLT
2004–2006	GMC	Sierra 3500	WT
2007	GMC	Sierra 3500 Classic	SL
2007	GMC	Sierra 3500 Classic	SLE
2007	GMC	Sierra 3500 Classic	SLT
2007	GMC	Sierra 3500 Classic	WT