Before you do the map bit, open the airbox, check the air filter, and take out the dog bone (you'll know it when you see it) to open up the air flow a little bit.
Hook the tank back up, but don't put it back in place. Get a 2x4 across the frame to set the tank on.
You'll now be able to see the throttle bodies.
Check to make sure they're in sync. If not, fix them now.
Then, put it all back together (with a clean air filter) and then do your decat and new pipe.
Have TuneECU read your current map. Save it off to a drive. Patience with this step, since it might take a while to read your map.
Download a map. I'd suggest starting with 20542.
Then enjoy yourself as you try to figure out which map is best.
Since the maps are easy to load, I'd start with one, ride it for a bit, download another, repeat.
I hope you have an A/C garage!