From: "Phil Payne" 

"Mark"  wrote in message
news:44f3b09c{at}w3.nls.net...
> Ah, yea, that sounds like a bogus "upgrade" sell for sure
  a piece of foam, similar to that in many a home window A/C unit, worth
about
> 50 cents>

In most cases, the only things worth filtering out of passenger compartment
air are turbo diesel particulates.  The standard filters fitted in our
markets don't do this - they're not fine enough.  You need to fit the ones
used in Japan.  They're only fractionally more expensive.

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