Or go in between stock and a full CAI, with a mini kit from Airaid. Just a new tube and a drop in filter in the stock filter box. The tube is bigger and more open to allow better airflow, and the anything above stock filters is better. I actually use an Airaid Jr tube, and a K&N filter.
Airaid MIT is your most economical option. I've seen dyno tests where an MIT tube did better than any of the CAI kits. The factory air filter and box already is a CAI. You just need a better tube. One thing to watch out for on the cheap Ebay parts is they are usually just a tube and filter, and suck in the hot engine compartment air. I'd steer away from those.
A forum community dedicated to Chevrolet Silverado and GMC Sierra pickup owners and enthusiasts. Come join the discussion about performance, modifications, classifieds, troubleshooting, maintenance, and more!