Reviewed By Robert O (Apple Valley, CA) Reviewed for a 2014 GMC Sierra —2/9/2017 9:08 AM
Bought this filter as an extra so I'll always have one ready to use... Been using K&N filters on everything I own for many years now with NO problems at all...
Reviewed By David V (Kennewick, WA) Reviewed for a 2007 GMC Sierra —1/30/2017 10:22 PM
After installing this K&N Cold Air Intake (which was exceptionally easy) my Duramax started purring like a kitten. The idle just smoothed out. I haven't checked the mileage yet, but I'm sure it has been positively affected. I wouldn't buy any other brand.
Reviewed By Ronald D (Swansboro, NC) Reviewed for a 2014 GMC Sierra —1/28/2017 8:24 AM
The system came in as ordered and all parts were there. Installation took me less than an hour and was really simple. I really haven't noticed any improvement in performance and mpg decreased approximately 1 mpg. It does make quite a bit of noise when you get on it but that I like! With the combination of the K&N and Flowmaster dual cat system, my Serbia sounds like a real monster! I would recommend the K&N 63 series to anyone!