I would think the scan tool features would work, no reason not too, but things like the speedo /g meters (that run off gps) are rubbish, apparently we were pulling 6G in a series 3 land rover.. :S
With the turbo it will pull a lot better (obviously) and seeing as its going to be remapped anyway I would, saves you having to get it remapped in the future if you decide to get them.
The jetta in the fast and furious was a 4 cylinder automatic. As for VR6s in, Im not sure. Have a look at this site: http://www.imcdb.org/vehicles_make-Volkswagen.html It shows you the different types of VWs (theres loads!!!) that have ever been in films / tv shows
You might be able to get away with that clearance, but personally I would take the tensioners off and reset the inner sprocket to correct timing, then you know your safe