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You're probably looking for more horsepower by reducing intake restrictions. Thanks to good engineering, the 200 & 700 series Volvos have very little restriction to begin with. The only noticable improvements that you could make would be to the snorkle tube that goes from the airbox to the front of the radiator (make it larger), and remove the rear screen from the Air Mass Meter if not already done so (but yeilds very little improvement). The rest of the intake system, the Throttle Body, Accordian Tube, airbox, etc, has very minimal drag.
The stock air filter is HUGE as far as automotive standards go in comparison to the size of the engine. You will probably not notice any kind of improvement by replacing the stock paper filter with a surgical-cotton filter. $10 buys a decent paper element that will last you for a decent amount of time (depending on your dust & dirt conditions). If you live in an area with a lot of blowing dust and you have to change your filter at every oil change, -then a reusable filter such as a K&N might be worth the money.
FYI, I personally use the WIX Premium air filters in my vehicles (lots of pleats, good flow, and good filtration). -they are also rebadged as NAPA and CarQuest filters and sold as standard shelf stock. I believe the OEM air filters from Volvo are made by either Mann or Crossland, but I'm not sure which.
God bless,
Fitz Fitzgerald.
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'87 Blue 245, NA 238K
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