It will actually improve the sound a little bit. The GTI exhaust is 2.5" whereas the TSI is 2.25", so a little bit bigger. No performance improvement.
I can't say about the stock MK6 GTI exhaust but the MK7/7.5 is in 2 pieces OEM GTI. Its a worthwhile upgrade IMO, I have done it to the MK7.5
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