Ya the technical highlights booklet is huge! It was a tiny tiny pamflet for other years...this ones gotta be at least 300 pages long.
For all needs and purposes, treat the MPS 6 as a completely new make/model with a completely new drivetrain/engine in terms of aftermarket.
You might be able to get standard 6 catbacks to fit, but then the bumpers in the way...one way or another your going to have to get the dremel out. (This is of course assuming the catback flange is in the exact location as a stock 6).
I'm sure intakes/catbacks will be soon coming, as those are the general made for every car on the market parts.
In the meantime, you can remove your resonator and do the airbox/tray mod, as per the standard 6's.
The reasonator is a large plastic box in the driver side wheel well, which serves to quiet in the intake. Removing that will probably add a good deal or induction sounds, including some more woosh sounds as well. Its held on by 2-3 nuts. I think their 14 or 15mm, then it just pulls off.
If you want more airflow, you can remove the tray in the bottom of the airbox.
Btw just a reminder...CP-E is looking for a donor MPS 6 car to possibly produce a turboback exhaust for the car. No donor, no exhaust.