[Focmachine]

Hi Fast Eddie, yes the standard filter box is fine. I like the k+n panel filter , it will add a bit more airflow which you can hear. The 0.01% power increase reminds me of Nissan GTR launch control videos!
Seriously though when I put a panel and iridium spark plugs on Mum’s 85kw LX auto it did have a bit more pep and better throttle response.
I wouldn’t pay @$8-650 for a pod filter.
The vents looked mean but they cut holes in the aftermarket bonnet and then put plates under them to stop water hitting the engine.
Those plates rubbed about 3mm off the chrome air intake pipe so I put the stock stone-chipped bonnet back on.
If you like the look of vents go for fake ones.
But hey the Focus is stylish enough!