I want my BOV to be noisy, but Ive been told that I can vent a blow-off valve to the atmosphere. Whats the deal?
There are many people who will say that if your car has a MAF (Mass Air Flow) sensor (which is most modern turbo cars), you can’t vent a BOV to atmosphere. This is not entirely true. In most cases you can, but it pays to be aware of the possible side effects. Quite often you may find the side effects are so minimal that they are not really a concern. This section describes in detail what happens when you vent to atmosphere.