I'm likely going the same route. Got the rims/tires before my GTI came in, I bought an St rear bar and will have to get it in before this weekend's Chicago region auto-x. I did just pick up the special tool to change it - serrated triple square bits. I looked into the Koni sports, but unfortunately you can't adjust the rear shock on the car - I'm sure thanks to the car design. I wouldn't mind a lighter and nicely tuned relatively subdued single exit exhaust if any exist that is.