Great build man.
I have Skoda Fabia HTP with 1,8T swap from Octavia vRS and I was thinkinh to max out my K03s too, but I changed my mind. I was on rolling road MAHA 3000 with the same twinkonus filter, 3" downpipe and 2,5" catles and not resonated exhaust, N75K valve, but reached only 190HP and 330NM
maybee wrong map, second 02 sensor wasn´t working...) so I decided to continue with GT3071r. Hope with better succes. Wishes you the best for next mods.
What mods are on your wish list? Intake manifold, intake cam from N/A 1,8 20V....?