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I have a K & N, no problems
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Me too, been using one for at least 15 years in the same truck. I'm 9000 miles short of 1/4 million miles and don't use any more oil than the first year when I bought the '91 truck new. Matter of fact, the only time I ever even had the valve covers off was to retorque heads at 30,000 when I installed my ATS turbo kit. Cleaned and oiled PROPERLY they do a great job of filtering. I spent 18 days as a chase truck on a major forest fire and the logging roads and USFS roads were so ground to dusty powder from all the heavy equipment we were ordered to run with our headlights on. After that mess was over when I cleaned my K&N I couldn't find even the slightest trace of anything that got by the filter in the intake ducting.
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there was no gain in performance
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I can understand that. The reason I went to one is because the ATS turbo airbox is a little on the small side and with a brand new paper filter under a load I'd show 3" on my filter restriction gauge. Zero restriction with the K&N as long as I clean it every 13-15K.
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if the air filter stays the same size, but somehow can flow more air, something has to be traded off. That something is filtration.
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Not really. It's a different filtering media that allows more flow, that doesn't mean it can't filter just as well. I'm fairly sure the all the Banks Sidewinder kits (plus air intake kits) come with a K&N, and with the many many Banks Sidewinder members here, if the filters didn't do the job they be lined up 50 deep posting threads condemning them.
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Our 7.3s consume much less air than small block gas motors that see high rpm.
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Not true if it's turbocharged. Any factory engine rep will tell you a turboed engine draws in 3 time the air of a comprable displacement non-turboed engine, gas or diesel.
