Got the full retrofit installed on my 2015 A3. One tip is that for the PCV, make sure you have a thin enough T30 socket to get to the PCV bolt next to the HPFP, my 3/8 drive one was too wide and I had to go out in the middle of the job to get something thinner.
Also, it seems like most people are using the left side of the 034 TMD, I used the right. I don't know if 034 made a design change or if the A3 is slightly different, but I had to use the right side to get the proper fit. Check fitment before installing your fittings. I also used both fittings to have more clearance to tighten down the hose clamp.
The last tip is for the hose to easily connect to the PCV, you need to come at it, as straight and flat as possible, otherwise it won't click in.
Only "bad" part is I never took it to the track with the stock PCV, so I can't say if this helped or not. Hopefully getting it to NJMP Lightning this week.