There are other considerations beyond just stuffing air down the intake, after all!

Racing applications aren't usually be best compromise for street use -- I've got a twenty somthing buddy with a naked K&N on his Honda -- I certainly hope it's well protected from splash, otherwise he's likely to suck a slug of water down too. Not very healthy for the engine. Most racing systems don't have to deal with water or snow -- only the LeMans type racing is done reguardless of weather, and I'll bet they have "restrictive" air filter housings of some sort to keep water out!

Part of what the "restrictive" air filter housing does is keep water out....

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!