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K&N filter

	I just read article about air filter on the internet.
Some of auto-crosser reported that while K&N has good air flow ,it also 
letting too much dirt get by,they determined by oil analysis and check
the cleanliness of the intake pipe after the filter. They said 
Trust Airinx has the same flow rate as K&N ,but the result of oil analysis
is much better. And Trust are much more expensive.
	** what is auto-cross ? ***