Why not ? They made the HKS Mushroom induction kit. Which has the filtration ability of cotton wool for a street-setup.
Possibily. Personally, I would say your wasting your money blinging an engine bay up. I'll agree it looks nice. But that's all it does. Furthermore, what's the point of it ? The bonnet is closed on the car most of the time. You can only revel in your bling when your parked up. I'll agree bling is appropriate - if you've got a show-car .. or a flagship for a company.
What possible advantage does it have over stock ? Erm - lemme think. One's shiny & the other isn't. If the stock one is being dodgy, give it a clean - or replace it with the cheaper stock item. I'd wager a brand new stock one vrs one of those HKS ones .. has little difference OR the stock one is better.
Spend your money on something more functional - like a decat pipe, suspension or brakes.