It helps a ton to get cold air to the engine instead of hot engine compartment air. Banks advertises a 39 h.p. gain with their cold air intake and superscoop. I was a little skeptical but immediately noticed a significant difference once installed. It just seems to run stronger. Highly recommend a cold air intake (and an air scoop as long as you aren't constantly driving through water over a foot deep) Mine has a drain on the other side to allow any water to run out.
07.5 GMC LMM SLE2, Z71 ECSB, ReadyLift 2" Kit, EFI Live-Autocal DSP5 by Idaho Rob, Magnaflow 4" downpipe back stainless exhaust w/DPF delete, Banks Ram Air Intake w/Super Scoop, Airlift 5000 Airbags w/In-cabin controllers, Retrax Tonneau Cover, Shocker Train Horns with 5 gallon on-board air and Viar Compressor, Bilstein 5100's, Line-X Bedliner, KMC XD Series "Hoss" Wheels, Mickey Thompson Baja ATZ's 285/70/17, B&W Turnover Ball