It is impossible to look at a picture of a cylinder head port and know if it "works" or doesn't.
A port can be carefully ground and finished so it looks great - and that is it. It could be worse than factory - you don't know.


The engine dyno or racetrack (best dyno on earth) will tell you if the engine (head, inlet, camshaft, turbo etc.....) was a well designed combination. A good flowing inlet and head will also produce higher power at lower boost levels.

Cheers