Bluespark plug and play upgrade

So after what seemed to take far longer than everyone else I have fitted a bluespark upgrade for my originally 135bhp 500 Abarth.

After all was fitted, I decided take it for a drive, the first 15 minutes seemed normal, no immediate change noticeable. after the 15 mins the ECU must have adjusted to the new setup that is on, the car really began to fly.

I have the setting on 'D' which is effectively level 4 out of 5, D has shown a huge bump in performance (can be hard to find traction). from what I have read elsewhere, the 'E' setting is even more of a bump but can be unsuitable for prolonged use, possibly on the clutch?

for £145 it is the first upgrade I have done and I am so happy with the results, apparently there is improved mpg also, but I am yet to see.. or care!

Have any of you experienced a good modification to partner up with the Bluechip box? perhaps air intake?