Assuming it is a different design? Can you post a photo? How many miles on your GSW?The fix was completed on my 2015 Golf Sportswagon today. It took 1 day.
They installed new tailpipe and cutout and upgraded software. Mileage not appreciably different, still 42+.
Power down and mileage up from my 2014 sportswagon which I turned in to VW last year. There may be a different final drive ratio.