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The concensus here seems to add up to it's not worth the money because there's no added benefit.
I totally disagree. There is one major detractor from using the OEM filter and that is when the filter gets slightly clogged, the change in air flow goes down tremendously, and the K&N has minimal pressure drop. This means your engine will run smoother, longer and more stable with time. This outweighs any performance or longevity benefits.
There is enough information out there on the benefits of better flow with a cotton K&N or other type compared to the OEM paper, but in order to realize the flow increase, you must also have the air intake, head and exhaust improved to have better flow. Under theses circumstances, the K&N is by FAR BETTER than the stock filter, and can increase hp by 2-5% over the stock filter.
If your engine is not modified, the stock filter is OK, but change it out like every 10k miles. That is the interval I clean the K&N on both my Volvo's
BTW I noticed a big difference in performance with the K&N on my 960 (unmodified). The 240 air box is pretty restrictive, so mods to it will help a lot, and if you remove the air horn and cut the front of the box open it will be a lot better, and will notice a difference over the stock filter if you do that.
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'89 245 Sportwagon, '96 960 sedan
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