Then it has to be the GTI 90 because the GTI SE is 130 HP. Is the bottom made of Polytec or Fiberglass? Polytec is definitely the GTI 90.
I have the 2018 GTI 90 and frankly, 43 MPH is acceptable for me (I am a little heavy). Mine has all the options except the "touring mode". I went on the lake today and the wind was strong from the North. Over 25 mph, I was starting to feel jolts on my back!
The MapTuner kit should bring 5 extra MPH but it is really expensive for a a mere 5 MPH (half of the price difference of getting a 130 HP). And I am not sure it would be too good on the engine life.