Sorry to be blunt, but I think you need to understand that your opinion isn't reality... Its an opinion. It doesn't hurt the resale of the truck in any way... Maybe YOU wouldn't buy it, but you're a schlub... Sorry, I have opinions too.
Banshee, I had a set on my 97 Dodge. 6" mitre cut's, almost level with the cab. I loved how they looked and how they sounded (I had a MBRP Silverline muffler on it). They only complaint I ever got was from guys riding in the back seat for more than an hour. It was loud as heck with the rear sliding window open. Its not difficult to install them yourself, but you'll need a good jigsaw to cut out the hole in the bed. The rest of it is basically plumbing, just make sure you use a decent flexpipe otherwise it'll leak.
Oh yeah, and if your truck smokes at all, be prepared to wash it often. Soot builds up ALL OVER the bed of the truck, and it easily rubs off onto clothes if you brush up against it.