Description

The AEM 21-681C Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle’s restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno-tested to fit specific Audi A4 models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is located in the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower. The intake tubing is constructed from mandrel-bent aluminum featuring a durable gunmetal gray powder coated finish. This air intake system was developed to accommodate the engine’s factory emissions control devices including the mass air flow sensor. The cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). The air intake system is backed by AEM’s Lifetime Limited Warranty. Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards while others are 50 state legal. View the 21-681C vehicle applications to determine the legal status for each vehicle.
AEM’s Performance Cold Air Intake Systems are tuned and dyno-tested to give your engine more power and acceleration by replacing the restrictive factory air filter, air intake tubing and air box assembly.

• Utilizes washable, reusable, oil-free synthetic filter media that preserves airflow efficiency, traps harmful contaminants, and provides long-term value over disposable filters.
• AEM Lifetime Limited Warranty

Fitment:
1999 Chevrolet Silverado 1500 Base
1999 Chevrolet Silverado 1500 LS
1999 Chevrolet Silverado 1500 LT
1999 Chevrolet Silverado 2500 Base
1999 Chevrolet Silverado 2500 LS
1999 Chevrolet Silverado 2500 LT
1999 GMC Sierra 1500 SL
1999 GMC Sierra 1500 SLE
1999 GMC Sierra 1500 SLT
1999 GMC Sierra 2500 SL
1999 GMC Sierra 2500 SLE
1999 GMC Sierra 2500 SLT
2000 Chevrolet Silverado 1500 Base
2000 Chevrolet Silverado 1500 LS
2000 Chevrolet Silverado 1500 LT
2000 Chevrolet Silverado 2500 Base
2000 Chevrolet Silverado 2500 LS
2000 Chevrolet Silverado 2500 LT
2000 Chevrolet Suburban 1500 Base
2000 Chevrolet Suburban 1500 LS
2000 Chevrolet Suburban 1500 LT
2000 Chevrolet Suburban 2500 Base
2000 Chevrolet Suburban 2500 LS
2000 Chevrolet Suburban 2500 LT
2000 Chevrolet Tahoe Base
2000 Chevrolet Tahoe LS
2000 Chevrolet Tahoe LT
2000 GMC Sierra 1500 SL
2000 GMC Sierra 1500 SLE
2000 GMC Sierra 1500 SLT
2000 GMC Sierra 2500 SL
2000 GMC Sierra 2500 SLE
2000 GMC Sierra 2500 SLT
2000 GMC Yukon SLE
2000 GMC Yukon SLT
2000 GMC Yukon XL 2500 SLE
2000 GMC Yukon XL 2500 SLT
2001 Chevrolet Silverado 1500 Base
2001 Chevrolet Silverado 1500 LS
2001 Chevrolet Silverado 1500 LT
2001 Chevrolet Silverado 1500 HD LS
2001 Chevrolet Silverado 1500 HD LT
2001 Chevrolet Silverado 2500 Base
2001 Chevrolet Silverado 2500 LS
2001 Chevrolet Silverado 2500 LT
2001 Chevrolet Silverado 2500 HD Base
2001 Chevrolet Silverado 2500 HD LS
2001 Chevrolet Silverado 2500 HD LT
2001 Chevrolet Silverado 3500 Base
2001 Chevrolet Silverado 3500 LS
2001 Chevrolet Silverado 3500 LT
2001 Chevrolet Suburban 1500 Base
2001 Chevrolet Suburban 1500 LS
2001 Chevrolet Suburban 1500 LT
2001 Chevrolet Suburban 2500 Base
2001 Chevrolet Suburban 2500 LS
2001 Chevrolet Suburban 2500 LT
2001 Chevrolet Tahoe Base
2001 Chevrolet Tahoe LS
2001 Chevrolet Tahoe LT
2001 GMC Sierra 1500 C3
2001 GMC Sierra 1500 SL
2001 GMC Sierra 1500 SLE
2001 GMC Sierra 1500 SLT
2001 GMC Sierra 1500 HD SLE
2001 GMC Sierra 1500 HD SLT
2001 GMC Sierra 2500 SL
2001 GMC Sierra 2500 SLE
2001 GMC Sierra 2500 SLT
2001 GMC Sierra 2500 HD SL
2001 GMC Sierra 2500 HD SLE
2001 GMC Sierra 2500 HD SLT
2001 GMC Sierra 3500 SL
2001 GMC Sierra 3500 SLE
2001 GMC Sierra 3500 SLT
2001 GMC Yukon Denali
2001 GMC Yukon SLE
2001 GMC Yukon SLT
2001 GMC Yukon XL 1500 Denali
2001 GMC Yukon XL 2500 SLE
2001 GMC Yukon XL 2500 SLT
2002 Cadillac Escalade Base
2002 Cadillac Escalade EXT Base
2002 Chevrolet Avalanche 1500 Base
2002 Chevrolet Avalanche 1500 North Face
2002 Chevrolet Avalanche 1500 On Road Edition
2002 Chevrolet Avalanche 1500 Z71
2002 Chevrolet Silverado 1500 Base
2002 Chevrolet Silverado 1500 LS
2002 Chevrolet Silverado 1500 LT
2002 Chevrolet Silverado 1500 WT
2002 Chevrolet Silverado 1500 HD LS
2002 Chevrolet Silverado 1500 HD LT
2002 Chevrolet Silverado 2500 Base
2002 Chevrolet Silverado 2500 LS
2002 Chevrolet Silverado 2500 LT
2002 Chevrolet Silverado 2500 HD Base
2002 Chevrolet Silverado 2500 HD LS
2002 Chevrolet Silverado 2500 HD LT
2002 Chevrolet Silverado 3500 Base
2002 Chevrolet Silverado 3500 LS
2002 Chevrolet Silverado 3500 LT
2002 Chevrolet Suburban 1500 LS
2002 Chevrolet Suburban 1500 LT
2002 Chevrolet Suburban 1500 Z71
2002 Chevrolet Suburban 2500 LS
2002 Chevrolet Suburban 2500 LT
2002 Chevrolet Tahoe LS
2002 Chevrolet Tahoe LT
2002 Chevrolet Tahoe Z71
2002 GMC Sierra 1500 Base
2002 GMC Sierra 1500 Denali
2002 GMC Sierra 1500 HT
2002 GMC Sierra 1500 SL
2002 GMC Sierra 1500 SLE
2002 GMC Sierra 1500 SLT
2002 GMC Sierra 1500 WT
2002 GMC Sierra 1500 HD SLE
2002 GMC Sierra 1500 HD SLT
2002 GMC Sierra 2500 Base
2002 GMC Sierra 2500 SL
2002 GMC Sierra 2500 SLE
2002 GMC Sierra 2500 SLT
2002 GMC Sierra 2500 HD Base
2002 GMC Sierra 2500 HD SL
2002 GMC Sierra 2500 HD SLE
2002 GMC Sierra 2500 HD SLT
2002 GMC Sierra 3500 Base
2002 GMC Sierra 3500 SL
2002 GMC Sierra 3500 SLE
2002 GMC Sierra 3500 SLT
2002 GMC Yukon Denali
2002 GMC Yukon SLE
2002 GMC Yukon SLT
2002 GMC Yukon XL 1500 Denali
2002 GMC Yukon XL 1500 SLE
2002 GMC Yukon XL 1500 SLT
2002 GMC Yukon XL 2500 SLE
2002 GMC Yukon XL 2500 SLT
2003 Cadillac Escalade Base
2003 Cadillac Escalade ESV Base
2003 Cadillac Escalade EXT Base
2003 Chevrolet Avalanche 1500 Base
2003 Chevrolet Avalanche 1500 North Face
2003 Chevrolet Avalanche 1500 On Road Edition
2003 Chevrolet Avalanche 1500 WBH
2003 Chevrolet Avalanche 1500 Z71
2003 Chevrolet Silverado 1500 Base
2003 Chevrolet Silverado 1500 LS
2003 Chevrolet Silverado 1500 LT
2003 Chevrolet Silverado 1500 SS
2003 Chevrolet Silverado 1500 WT
2003 Chevrolet Silverado 1500 HD LS
2003 Chevrolet Silverado 1500 HD LT
2003 Chevrolet Silverado 2500 Base
2003 Chevrolet Silverado 2500 LS
2003 Chevrolet Silverado 2500 LT
2003 Chevrolet Silverado 2500 HD Base
2003 Chevrolet Silverado 2500 HD LS
2003 Chevrolet Silverado 2500 HD LT
2003 Chevrolet Silverado 2500 HD WT
2003 Chevrolet Silverado 3500 Base
2003 Chevrolet Silverado 3500 LS
2003 Chevrolet Silverado 3500 LT
2003 Chevrolet Suburban 1500 LS
2003 Chevrolet Suburban 1500 LT
2003 Chevrolet Suburban 1500 Z71
2003 Chevrolet Suburban 2500 LS
2003 Chevrolet Suburban 2500 LT
2003 Chevrolet Tahoe LS
2003 Chevrolet Tahoe LT
2003 Chevrolet Tahoe Z71
2003 GMC Sierra 1500 Base
2003 GMC Sierra 1500 Denali
2003 GMC Sierra 1500 SL
2003 GMC Sierra 1500 SLE
2003 GMC Sierra 1500 SLT
2003 GMC Sierra 1500 WT
2003 GMC Sierra 1500 HD SLE
2003 GMC Sierra 1500 HD SLT
2003 GMC Sierra 2500 Base
2003 GMC Sierra 2500 SLE
2003 GMC Sierra 2500 SLT
2003 GMC Sierra 2500 WT
2003 GMC Sierra 2500 HD Base
2003 GMC Sierra 2500 HD SLE
2003 GMC Sierra 2500 HD SLT
2003 GMC Sierra 2500 HD WT
2003 GMC Sierra 3500 Base
2003 GMC Sierra 3500 SLE
2003 GMC Sierra 3500 SLT
2003 GMC Yukon Denali
2003 GMC Yukon SLE
2003 GMC Yukon SLT
2003 GMC Yukon XL 1500 Denali
2003 GMC Yukon XL 1500 SLE
2003 GMC Yukon XL 1500 SLT
2003 GMC Yukon XL 2500 SLE
2003 GMC Yukon XL 2500 SLT
2004 Cadillac Escalade Base
2004 Cadillac Escalade ESV Base
2004 Cadillac Escalade EXT Base
2004 Chevrolet Avalanche 1500 Base
2004 Chevrolet Avalanche 1500 Z66
2004 Chevrolet Avalanche 1500 Z71
2004 Chevrolet Silverado 1500 Base
2004 Chevrolet Silverado 1500 Hybrid
2004 Chevrolet Silverado 1500 LS
2004 Chevrolet Silverado 1500 LT
2004 Chevrolet Silverado 1500 SS
2004 Chevrolet Silverado 1500 WT
2004 Chevrolet Silverado 1500 Z71
2004 Chevrolet Silverado 2500 Base
2004 Chevrolet Silverado 2500 LS
2004 Chevrolet Silverado 2500 LT
2004 Chevrolet Silverado 2500 WT
2004 Chevrolet Silverado 2500 HD Base
2004 Chevrolet Silverado 2500 HD LS
2004 Chevrolet Silverado 2500 HD LT
2004 Chevrolet Silverado 2500 HD WT
2004 Chevrolet Silverado 3500 Base
2004 Chevrolet Silverado 3500 LS
2004 Chevrolet Silverado 3500 LT
2004 Chevrolet Silverado 3500 WT
2004 Chevrolet Suburban 1500 LS
2004 Chevrolet Suburban 1500 LT
2004 Chevrolet Suburban 1500 Z71
2004 Chevrolet Suburban 2500 LS
2004 Chevrolet Suburban 2500 LT
2004 Chevrolet Tahoe LS
2004 Chevrolet Tahoe LT
2004 Chevrolet Tahoe Z71
2004 GMC Sierra 1500 Base
2004 GMC Sierra 1500 Denali
2004 GMC Sierra 1500 SLE
2004 GMC Sierra 1500 SLT
2004 GMC Sierra 1500 WT
2004 GMC Sierra 2500 Base
2004 GMC Sierra 2500 SLE
2004 GMC Sierra 2500 SLT
2004 GMC Sierra 2500 WT
2004 GMC Sierra 2500 HD Base
2004 GMC Sierra 2500 HD SLE
2004 GMC Sierra 2500 HD SLT
2004 GMC Sierra 2500 HD WT
2004 GMC Sierra 3500 Base
2004 GMC Sierra 3500 SLE
2004 GMC Sierra 3500 SLT
2004 GMC Sierra 3500 WT
2004 GMC Yukon Denali
2004 GMC Yukon SLE
2004 GMC Yukon SLT
2004 GMC Yukon XL 1500 Denali
2004 GMC Yukon XL 1500 SLE
2004 GMC Yukon XL 1500 SLT
2004 GMC Yukon XL 2500 SLE
2004 GMC Yukon XL 2500 SLT
2005 Cadillac Escalade Base
2005 Cadillac Escalade ESV Base
2005 Cadillac Escalade EXT Base
2005 Chevrolet Avalanche 1500 Base
2005 Chevrolet Avalanche 1500 LS
2005 Chevrolet Avalanche 1500 LT
2005 Chevrolet Avalanche 1500 Z66
2005 Chevrolet Avalanche 1500 Z71
2005 Chevrolet Silverado 1500 Base
2005 Chevrolet Silverado 1500 Hybrid
2005 Chevrolet Silverado 1500 LS
2005 Chevrolet Silverado 1500 LT
2005 Chevrolet Silverado 1500 SS
2005 Chevrolet Silverado 1500 WT
2005 Chevrolet Silverado 1500 Z71 Off-Road
2005 Chevrolet Silverado 1500 HD Base
2005 Chevrolet Silverado 1500 HD LS
2005 Chevrolet Silverado 1500 HD LT
2005 Chevrolet Silverado 2500 HD Base
2005 Chevrolet Silverado 2500 HD LS
2005 Chevrolet Silverado 2500 HD LT
2005 Chevrolet Silverado 2500 HD WT
2005 Chevrolet Silverado 3500 Base
2005 Chevrolet Silverado 3500 LS
2005 Chevrolet Silverado 3500 LT
2005 Chevrolet Suburban 1500 LS
2005 Chevrolet Suburban 1500 LT
2005 Chevrolet Suburban 1500 Z71
2005 Chevrolet Suburban 2500 LS
2005 Chevrolet Suburban 2500 LT
2005 Chevrolet Tahoe LS
2005 Chevrolet Tahoe LT
2005 Chevrolet Tahoe Z71
2005 GMC Sierra 1500 Base
2005 GMC Sierra 1500 Denali
2005 GMC Sierra 1500 Hybrid
2005 GMC Sierra 1500 SLE
2005 GMC Sierra 1500 SLT
2005 GMC Sierra 1500 WT
2005 GMC Sierra 1500 HD SLE
2005 GMC Sierra 1500 HD SLT
2005 GMC Sierra 2500 HD Base
2005 GMC Sierra 2500 HD SLE
2005 GMC Sierra 2500 HD SLT
2005 GMC Sierra 2500 HD WT
2005 GMC Sierra 3500 Base
2005 GMC Sierra 3500 SLE
2005 GMC Sierra 3500 SLT
2005 GMC Sierra 3500 WT
2005 GMC Yukon Denali
2005 GMC Yukon SLE
2005 GMC Yukon SLT
2005 GMC Yukon XL 1500 Denali
2005 GMC Yukon XL 1500 SLE
2005 GMC Yukon XL 1500 SLT
2005 GMC Yukon XL 2500 SLE
2005 GMC Yukon XL 2500 SLT
2006 Cadillac Escalade Base
2006 Cadillac Escalade ESV Base
2006 Cadillac Escalade EXT Base
2006 Chevrolet Avalanche 1500 LS
2006 Chevrolet Avalanche 1500 LT
2006 Chevrolet Avalanche 1500 Z66
2006 Chevrolet Avalanche 1500 Z71
2006 Chevrolet Silverado 1500 Hybrid
2006 Chevrolet Silverado 1500 LS
2006 Chevrolet Silverado 1500 LT
2006 Chevrolet Silverado 1500 SS
2006 Chevrolet Silverado 1500 WT
2006 Chevrolet Silverado 1500 HD LT
2006 Chevrolet Silverado 2500 HD LS
2006 Chevrolet Silverado 2500 HD LT
2006 Chevrolet Silverado 2500 HD WT
2006 Chevrolet Silverado 3500 LS
2006 Chevrolet Silverado 3500 LT
2006 Chevrolet Silverado 3500 WT
2006 Chevrolet Suburban 1500 Base
2006 Chevrolet Suburban 1500 LS
2006 Chevrolet Suburban 1500 LT
2006 Chevrolet Suburban 1500 LTZ
2006 Chevrolet Suburban 1500 Z71
2006 Chevrolet Suburban 2500 LS
2006 Chevrolet Suburban 2500 LT
2006 Chevrolet Tahoe Base
2006 Chevrolet Tahoe LS
2006 Chevrolet Tahoe LT
2006 Chevrolet Tahoe Z71
2006 GMC Sierra 1500 Denali
2006 GMC Sierra 1500 Hybrid
2006 GMC Sierra 1500 SL
2006 GMC Sierra 1500 SLE
2006 GMC Sierra 1500 SLT
2006 GMC Sierra 1500 WT
2006 GMC Sierra 1500 HD SLE
2006 GMC Sierra 1500 HD SLT
2006 GMC Sierra 2500 HD SL
2006 GMC Sierra 2500 HD SLE
2006 GMC Sierra 2500 HD SLT
2006 GMC Sierra 2500 HD WT
2006 GMC Sierra 3500 SL
2006 GMC Sierra 3500 SLE
2006 GMC Sierra 3500 SLT
2006 GMC Sierra 3500 WT
2006 GMC Yukon Denali
2006 GMC Yukon SL
2006 GMC Yukon SLE
2006 GMC Yukon SLT
2006 GMC Yukon XL 1500 Denali
2006 GMC Yukon XL 1500 SL
2006 GMC Yukon XL 1500 SLE
2006 GMC Yukon XL 1500 SLT
2006 GMC Yukon XL 2500 SLE
2006 GMC Yukon XL 2500 SLT
2007 Chevrolet Silverado 1500 Classic Hybrid
2007 Chevrolet Silverado 1500 Classic LS
2007 Chevrolet Silverado 1500 Classic LT
2007 Chevrolet Silverado 1500 Classic SS
2007 Chevrolet Silverado 1500 Classic WT
2007 Chevrolet Silverado 1500 HD Classic LT
2007 Chevrolet Silverado 2500 HD Classic LS
2007 Chevrolet Silverado 2500 HD Classic LT
2007 Chevrolet Silverado 2500 HD Classic WT
2007 GMC Sierra 1500 Classic Denali
2007 GMC Sierra 1500 Classic Hybrid
2007 GMC Sierra 1500 Classic SL
2007 GMC Sierra 1500 Classic SLE
2007 GMC Sierra 1500 Classic SLT
2007 GMC Sierra 1500 Classic WT
2007 GMC Sierra 1500 HD Classic SLE
2007 GMC Sierra 1500 HD Classic SLT
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
2007 GMC Sierra 3500 Classic SL
2007 GMC Sierra 3500 Classic SLE
2007 GMC Sierra 3500 Classic SLT
2007 GMC Sierra 3500 Classic WT