K&N
Who has replaced their stock air filter with a K&N? Are they really better? Improve performance, gas mileage, etc.
Forum Discussion
They're okay on gas engines. But they're totally ineffective on a diesel engine.
Diesel engines' high compression also make the intake air act differently than a low compression gas engine. It sucks dirt right through a diesel K&N air filter.
Diesel engines' high compression also make the intake air act differently than a low compression gas engine. It sucks dirt right through a diesel K&N air filter.
