I just got off the phone with Cosworth. Their filters seem to be stepchildren. Noone there knew a lot about them, and readily admitted that they made them "because some people can't afford Cosworth engines, and want a Cosworth part in their car, so we created a filter--everyone needs filters--to help start these people out with our products."
No flow-data aside the 10%+ was given. No dyno data was given. Filtration was stated as better than OEM paper. Service life was described to me as equal to or shorter than OEM, so stick to the OEM replacement schedule. Technically they claim it can be washed with soap and water as it is synthetic, but I don't really think it's the BEST course of action (personal opinion). Of course, I also would rather buy a new K&N than clean it, because of the over-oiling/risk of damaging the media.
Does anyone have any heads-up tests vs. K&N in an environment that shows either superior filtration or flow? (dyno, etc.)
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