Here's a dyno graph I found over on the www.silveradoss.com forum. The guy replaced the stock tube with a K&N tube and gain 7 hp with the swap. He's a tuner for our trucks (www.pcmforless.com), sounds like he's got a nice SS.
Jim
http://mywebpages.comcast.net/bherter/04si...rintakevskn.jpg
Here's the entire post about dynoing his truck.
http://www.silveradoss.com/forums/in...showtopic=3711