If everyone is so concerned about air polution ride a bike(which is way cheaper than a new cat, or a van at all for that matter) or drive a geo metro.
I know you should do what you can yada yada. but being on a automobile listserver and condeming others for poor emissions equipment, seems odd. 
the range of emissions standards from state to state/ even county to county is wide.  Clinton county NY where I live does not even have emission testing(yet).

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