BS on the gears, the prices and everything they've told you. Have them take just about
everything back that they will! Order the SC from Klaus's guy and get it installed locally. Since your HUMMER dealer is full of crap, check other GM dealers or speed shops in the area.
You don't need the $1300 program because the SC comes with a programmer. Keep in mind, the truck will be louder with the SC under load.
Just keep the exhaust, unless they have your original and can put it back on also. Once you find a reputable installer, you can alway order those parts and have them installed by the new guys.
Sorry, but what that dealership is doing really pisses me off.
Again, BS on the gears.