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They are for show, but they can also produce an intake roar that some like.
I just think it is ass backwards to take off a factory cold air intake and install one that draws heated air from under the hood. If it wasn't drawing in that warm air there wouldn't be any roar.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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