it was me that had one fitted to my MK5 GTi
had to take it back and the place that supplied it to me changed it without a quibble mainly because they too were very surprised how loud it was
as soon as the car went over 2k revs everbody at the side of the road would almost break their necks in a WTF moment, was funny for about 2 minutes then I knew I had to get it off
the Milteks were on back order and had to wait 2 weeks for one, hardly drove the car until I got it changed
looked a good quality system but sounded like a chaved up corsa