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you can get a engineer to approve disabling emissions equipment??? :) if you get defected for that and fight it, the engineer might end up in a whole lot of bother...

the reason an atmo BOV is illegal is the air can contain pollutants (hydrocarbons and the like) from the crankcase (via the PCV) that are not legally allowed to be vented to atmosphere - they have to be burnt and passed through the cat. it has nothing to do with being filtered on the way out. filtering does not remove any emissions or make it legal.

my car has atmo bov's too, but good luck to any police trying to see them!

...

That is correct, so the way to do it properly is to have a proper plumbed back oil catch can system. So all that is venting is normal air that went in in the first place.

Point is, if you have a proper engineers cert with you the cops will probably leave you alone as its too much hassle for them. If they do book you, with a REALLY good lawyer you could twist it back around on them and try and get themselfs charged with wasting police time and tax payers money, as you proved to them before receiving the ticket it was engineered. If you had the money it would be worth a laugh anyway.

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