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Im looking into making my own cold air intake, ive heard it's not too hard. I've been told i need a K&N filter, 3" tubing, and heatshield. Which K&N filter am i supposed to buy? im sure there are many out there. I need one for an e34 (92 525i) so i was hoping someone could point me in the right direction... If anyone could also tell me how to do the tubing, or give me a site which would tell me i would be thankful.

Thanks in advance.
 
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