Last forever, that is. The K&N filter will give you up to an additional 15% performance due to the increased air flow, and the black diesel oil that is normal for these engines, will only serve to add to the filtration, as the K&N system is an oiled filter that can (and is supposed to be) cleaned and re oiled on a regular basis. Remember that the K&N filters are "lifetime" and will never be disposed of, just cleaned and re-oiled...

www.knfilters.com/default.htm

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Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."