Looking to upgrade my 2500HD

I have a 2003 Silverado 2500HD with the 8100/Allison trans. Its all stock except a dual exhaust that needs to be redone. Im looking for some good responsive mods to do to my truck that will wake it up. First on the list will probably be a K&N intake kit. Ive looked at a comp cam and their F.A.S.T. programmer but i think thats a bit much work/money that i wanna put into it. Any input will be great. Thanks!

$400 or less could get you up to 100HP
http://www.socaldiesel.com/index.htm

I think he's got the 8.1 gas engine.

You may want to try looking into a custom tune such as Nelson, Wheatley, Wait4me, ect.

my bad.. I did not catch that.