Well, 09's for sure do have the Euro springs. And I think 2008.5 with the very first TSI 2.0T have them too. I have several friends who had 2009 GTI's and while they were still pretty high, they weren't 2006 to early 2008 high lol
All US spec Fahrenheit's had the 2006/2007 US spec springs (AKA God damn minivan ride height). In 2008, US spec GTI's got the Euro springs. They're not an inch lower, but 0.6" lower all around. If you're doing those, you honestly may as well get new Bilstein or Koni shocks, strut mounts and bearings, etc. How many miles?