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Video - K&N Performance Air Intake 63-3077 was Designed for 2011 & 2012 GMC Sierra 2500/3500 HD 6.6L Diesel and Chevy Silverado 2500/3500 HD 6.6L Diesel K&N performance air intake 63-3077 was designed for 2011 & 2012 GMC Sierra 2500/3500 HD 6.6L Diesel and Chevy Silverado 2500/3500 HD 6.6L diesel models. This K&N air intake modification showed an estimated gain of 19.3 horsepower at 2420 RPM when tested on the K&N dynamometer. Discover how easy it is to install power-gaining performance on your 2011 or 2012 GMC Sierra 2500/3500 HD with the 6.6L diesel engine or Chevy Silverado 2500/3500 HD with the 6.6L diesel engine.

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