Airraid

I own a 2002 and have been pulling a 2800 Lb camper over the past couple of years. Recently I purchased a Kodiak at 3800 lbs and I need to get my beast breathing a bit better. Has anyone upgraded their intake with an Airaid or similar induction system and if so what improvements, if any, did they notice? I am also interested if there are headers/exhaust add ons to improve HP. I have read that Olds tested this engine with dual turbos and pushed out 400hp. Now that's what I'm talking about.

RB