Both my son and I purchased our GTIs from Team VW. Yes they can do the the tune plus other installations of APR mods. My son had some of his mods installed by them on his MK6. No complaints. The service manager has changed hands in the last 8 months and I’m not up to date on what the shop atmosphere is like now. I had my APR tune installed by GRD Tune located on the westside of Chicago. They are an authorized APR dealer and have most of the mod parts in stock (Team VW gets a lot of their parts from them). When APR has their next sale I plan to purchase parts from GRD Tune, install them myself, but let them install the tunes. Not to worry about voiding the warranty. On the most part the GTI internal engine parts are pretty stout. Also based on my son’s experience and many other owners, they have been free of issues using APR mods.