I just got my 2005 MK4 Jetta GLI 1.8T back from Goodspeed Performance Lab. I had and APR Stage I tune, APR Carbonio Intake, and an APR R1 Diverter valve installed today (Saturday, September, 2017). The car is a project that has 156K miles, just a toy that I wanted years ago but could never afford back then. Goodspeed again did a fantastic job on the VW. This is the third car that has been tuned and upgraded by Goodspeed for me and I am extremely happy everytime. I highly recommend Jon and Goodspeed. They checked out the GLI before they did the tune on it because of it's age and mileage to make sure it was safe for the car. This is an honest business that looks out for their customers. If you are in the VW/ Audi family definitely check out Goodspeed Performance.