Well i can provide 1st hand feedback of an APR tune on the same engine (although in a Mk7 Golf R) as a friend of mine owns one. Stock the car was brisk at best but felt restricted. After the stage 1 tune the car was genuinely much faster, i believe they quote around 60kw and 100nm gain over stock. He has now progressed onto the stage 2 tune (with intake and down pipe) and is basically at the safe limit of the stock turbo now.
The increase in power was certainly noticeable from stock to stage 1. It goes from being a brisk car to genuinely being a quick car. The size of the turbo on the 206kw 2.0TSI engine has quite a bit of headroom available for power increases up to around the 300kw mark. Its a much larger turbo than the one fitted to the Mk6 R.
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