I'm getting ready to install a Pacbrake on my 07, and have decided to do the air system myself. I would recommend getting a better compressor, look at some of the stuff sold for cars with pneumatic suspensions. Viair makes some Compressors
I picked up a pretty big one and have mounted it under the passenger side with a big splash pan to protect it. There are many other brands as well. Amazon and Ebay have a big selection size and shape tanks, there's plenty of room under the truck to stash one.