that is a great price for the cat back. That must be the sport system and it is basically employee price,I would recommend a header over the manifold.y touring system cost me $586 tax in with the angled tip.

 

A custom mapping takes all day. Your car will be on the dyno for hours so the tech can mess with the computer and find the peak performance for all your new parts. What the dealer is doing is typing in a code to the computer that is already pre-installed from the factory..okay, but not the best. IF you add a smaller pully or high-flow injectors, you need to get a custom map job so you dont run too lean, and so you can get MAX power.
BUT dont do the custom map job till you are totally done with the mods on your car. Make the last thing you do the stage 2 so the shop doing the custom mapping can install the injectors and pully. I will put my dyno sheets up when i get around to it. Good luck man.