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bmjb
 Post subject: Re: Air filters
PostPosted: Sat Nov 07, 2009 11:31 pm 
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Joined: Tue Nov 27, 2007 12:01 am
Posts: 163
Location: Devon
geo wrote:
Also, what's the little cylindrical air filter at the front of the engine for ?


I believe it's the filter for the air pump, only there on S4's not earlier cars. Cabin pollen filters weren't introduced until round about the GTS.
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stratfordshark
 Post subject: Re: Air filters
PostPosted: Sat Nov 07, 2009 11:35 pm 
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Joined: Mon Nov 05, 2007 11:22 pm
Posts: 1469
Location: Stratford-upon-Avon
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Not a pollen filter but a filter for the auxiliary air pump (reduces emissions from cold engine - designed mainly to meet US regs).

I actually changed the filter in my first 928 before I knew better!

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