No one on GenVibe or MO has ported their cylinder head.You could possibly see gains of 15-20 hp.There are no aftermarket cylinder heads available.A proper port & polish with a 3 way valve job + increasing the valve diameter 1-2mm would run around $1000-1500 at a reputable shop.You would also need to get a custom intake manifold and branded header, downpipe & midpipe to take full advantage of it. (probably another $750.)Not really worth it for what you get out of it. I had done research on this last year.
My Fleet:
'15 Ford Fusion AWD Titanium 2.0 Tutbo
'14 Lincoln MXZ AWD 2.0 Turbo
'14 Nissan Pathfinder AWD SL
'05 Pontiac Vibe AWD