haha, okay, well since rain was forecasted for today, and yes, it poured buckets here all day, I went to a friend's shop and he mounted the underdeck storage box that he had made for me, custom-sized to fit. It's tucked up underneath the deck; the frame around the door is the same size all around. I've been wanting this for a while; having a regular-cab sucks when you have a passenger and a 2nd set of riding gear.
Damn, it's too shiny; now I'll have to wash my truck and maybe polish the deck.
Still haven't installed the 6637; rather than find an angled piece of 4" SS tubing, I might just get a 2000+ air intake pipe from a wrecker.