What "good" it does is exactly what you stated in your post.  It helps keep emissions in check.
Running without it is illegal in most states in the USA.  It is certainly immoral everywhere.
In your spare time do you pour chemicals into waterways?  Hunt endangered species?  Just how
far does your lack of concern for the environment extend?

Bill in the Southwest

----- Original Message -----
From: "David and Shirin" <daveshirin@ENERGYUNITED.NET>

Is it really necessary to have the EGR valve working on a 1982 aircooled vanagon?  Other than
keeping emissions in check what good does it do?  I have been running with mine unhooked for a
while now and have noticed no difference.