K&N Cold Air Intake Kit: High Performance, Guaranteed to Increase Horsepower: 1999-2004 Chevy/GMC (Silverado 1500, Sierra 1500) 4.8L and 5.3L V8, 77-3021KP

Thanks so much      I just installed your cold are intake and I am very impressed with the change.  I own a 2001 Silverado with the 5.3 V8.  I did get 18-19 mpg, but now I'm managing 21-22mpg.  That's incredible for a V8 4X4.  Take off is outstanding compared to previously.  Also the sound is a big improvement.  On hard take offs, (very common in my daily driving) you can actually hear it pull so much more air.  And at cruising, (90-95mph) it has a slight whistle to it.  I love it.  It is the best thing I have done for any of my vehicles.  I advise it to anyone with an engine of any type.  Thanks so much for your product.  I really do appreciate it.