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Old 09-06-2013, 05:51 AM   #8 (permalink)
Master EcoModder
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Old thread dig, but just found article/study related to topic for diesel air filtration:

Doesn't agree with my experience, they indicate on vehicles tested there was little adverse effect on FE with a dirty filter, main effect was reduced performance.

Here's another Diesel article on air restriction and intakes, not as related but good info:
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