Shouldn't be that much if your exhaust is a bolt in setup....still shouldn't be that much if it's all welded either....i'd say $70tops. I'd say a shop would charge $50.
The hitch is kinda a precise sorta deal to mod. I'd take it and the truck to a welding/fab shop, and see what they'd do. Might be $100, but can easily be done at home yourself with a welder and a grinder.