In short, yes, a stock GTI exhaust is louder than a stock TSI exhaust. It is bigger, 2.5" compared to 2", in diameter. Not massively louder, but noticeably louder.
It is not a perfectly straightforward job though. You will need to buy a GTI real valance (the black bit at the bottom of the rear bumper). In your case this will have to be for a MK7.5 GTI. MK7 GTI valance does NOT fit! Then you will need an adaptor from an exhaust shop to join the 2.5" GTI exhaust to the 2" TSI front pipe.
NOTE you will also need a MK7.5 GTI exhaust, a MK7's exhaust won't fit properly. It will bolt up, but the exhaust tips are wrong.
It's all easy enough to do, just need to remember the above. Photos and details in this thread
Project 145TSI
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