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      09-12-2008, 09:26 PM   #21
UdubBadger
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Drives: '04 330i ZHP
Join Date: Dec 2007
Location: Chicago Burbs

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2004 BMW 330i ZHP  [4.75]
2011 135i  [3.73]
2008 328xi  [4.38]
no you don't need after market intake for it but it helps. you can use a stock intake and just buy a more porous after market air filter like a K&N for like $75 or whatever they cost

its basically in a nutshell pushing more air into the engine for combustion thus making more power.