Hi tbblitz,
I fitted a snorkel to my new 2.5CR D22. I added it because I like the fact that the air entering the snorkel is from above the wind screen where the air will be cleaner and cooler. I also will probably never drive through bonnet deep water.
Air from inside the guard will be drawn in from the engine bay as well as from under the guard. I figure it'll be less dusty. There is no discernible performance gain from the snorkel.
You do hear a whooshing from the turbo which I didn't like initially although now it tells me when I'm using too much foot on the throttle. I drive not to spool up the turbo and it seems to be saving me some fuel.
The noise is loud though, especially when the windows are up.
Cheers,
DJ