I have a 2004 Silverado with the 5.3L, and am looking to upgrade to an electric fan over the engine driven. The question I have to people who have done this before is what is the best, reasonably priced electric fan to get? I've read that fans out of 05' and newer Silverado's will bolt right up, but which is a good option? All the reviews I read on Amazon for the aftermarket fans are mixed, and there are quite a few reviews concerning the amount of amperage the fans draw. I was going to get the wiring harness Ill need to have the computer control the fan from LS1fans.com and the tune to enable the function from black-bear-performance. One other question I have is what amperage alternator will I need to support the electric fan draw? And feedback is greatly appreciated.