I got a good taste of what VW's lay down at Waterfest in NJ - one of the largest (if not THE largest) VW gatherings/shows/drag events of the year.
Even modded GTI's were NOT that impressive. I spent a good hour at the strip just watching driver after driver, high 14's were the name of the game. We're talking decently modded turbocharged cars here. I saw very few Vdubs make their way into the 13's - period, and it was usually an R32.
So all in all, I can see you taking a new GTI if you have a good race.