Exhaust is one thing the shop did a very nice job on. I provided them with downpipe flanges (from a 2.8, they are the same) to mount to the manifolds and they welded custom pipes to a set of mufflers another customer had taken off his car, 718 cayman I believe. Here's an in process pic before it was finished and wrapped, so you can see the approx routing.
What turbo setup are you thinking of on your 2.7? I saw your tease picture but couldn't make out what it was, some newfangled electric assist no doubt