A downpipe and/or exhaust will do basically nothing power-wise without a remap - all it will give you is some noise.
If you are craving more power, get the car remapped. Looks like there aren't a great deal of remap options for the 1.4 TSI, but Burger Motorspots have a tuning box and these are very well regarded amongst the MK7 GTI and R guys: Burger Motorsports JB4 VW / Audi / Skoda Group 10 – 1.2L & 1.4L – AutoInstruct
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