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If I take the air filter out of my T5 and my wifes' 850 they
have the same part number. But, as I recall, one has taller
pleats and presumably more surface area (and should flow more
air). I wonder if there are slight differences in Volvo air
filters that have not been taken into account when reporting
if the K&N improved performance or not.
(Our 850 has smaller pleats but it has also been replaced
as part of a 30K tuneup by the dealer. The 70s' filter
is from the factory. I believe the filter in the 850 has a
newer manufacturing date stamped on it. Both are Volvo parts)
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