[MetzO7]

I have a 99 Silverado 1500 with the 5.3 Ltr engine with a superchips programer on the fuel economy setting. I installed K&N's 77 series CAI and have noticed a little more power as for the milage gains havn't checked due to the fact that I only drive the truck 4 miles to work and back barely gets to opperating temp. It does make the engine sound mean starting at 2000 RPM. worth the price of the intake alone