9. With that, we reconnected the MAF plug to the sensor. The plug will only go one way, so don't force it if it's not going on. | 
10. Moving on to the throttle body, attach the 90-degree elbow, and loosely tighten the hose clamp just enough to keep it from falling off. | 
11. Go back to the MAF and connect the silicone step-hump hose and again loosely tighten the hose clamp. |
12. Now it's time for the shiny stuff. Insert the mandrel-bent piece of tubing between the MAF and the throttle body. You can go back and adjust the tube, so it doesn't hit anything, and tighten all the clamps. | 
13. The last step before we fired up the beast and strapped it to the dyno was to install the filter. The filters come pre-oiled, so all you have to do is remove the plastic wrapper and slide it on the end of the intake tube. With everything tight and ready to go, we started the truck and checked for air leaks, creaks, and rattles, of which we had none. |  |
The Final Word
The K&N Series-77 system freed up 8 horsepower on the Silverado, and when the go pedal is mashed, you can hear the difference. Because the filter can be serviced, you shouldn't have to buy another one for as long as you own the truck. So, if you have a few hundred bucks and about an hour, you too can have more power on tap.