That is strange! A DP for a Tiguan hardly make it louder. If it is a vibration I believe may be some installation issue ? If I was him I would go to another exhaust place and get them have a look. Specially when DP coupled with the stock cat back section, if not aligned properly or not mounted correctly DP can vibrate and hit everywhere. I had a slimier issue where DP hits the tail-shaft center bearing housing making very annoying noise when car accelerate. Then got it fixed by making a small bend around that point.
Software got nothing to do with the vibration. I drove Tig without stage 2 tune couple of days and actually after software installation it became little bit more louder
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