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  1. #1
    Mark
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    Where can I purchase an air filter?

    Hello, I just purchased a 1985 635csi and I need to replace the air filter. Where can I purchase one? Also who sells a cold air intake for this car/engine? Anyone notice HP gain with a cold air intake?

    Thanks,
    Mark
    1991 525i
    1995 840ci
    1996 328i
    1997 328i
    1999 528iT
    1985 635csi



  2. #2
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    Member No: 6159 romario has a spectacular aura about romario has a spectacular aura about romario has a spectacular aura about romario's Avatar
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    BavAuto, eBay, BimmerWorld.


  3. #3
    jeff hobbs
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    Air Filters

    I was able to get 4 of them via Auto Zone (online)for about $8.00 each.
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  4. #4
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    Member No: 75052 kelvin is an unknown quantity at this point kelvin's Avatar
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    it's already a cold air system---------------------->

    I was told years ago by a guy who owned a shop and built bmw race engines that the intake system on my (then) 535i e28 was already a cold air system. It is the same setup on the e24. You can buy a k and n filter that drops in and you might get 2hp. it's better than sucking in a lot of hot air (unshielded cone filter) and losing 5-10hp. There is a plastic shield behind the passenger headlights that you could remove, and if you really wanted you could remove the high beam headlight on that side and replace it with a cool looking screen that fits inside the headlight chrome ring. I bought one on ebay for my 535i maybe 6-7 years ago.
    -Kelvin
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  5. #5
    Ray7er6er5er3er
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    I've found the best prices at AutohausAZ...on most things for 6ers.

    Give them a try
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