Quote:
Originally Posted by TestDrive
So far as I know, no testing equipment measures grams per mile directly. Grams per mile is always a calculated result based on a number of parameters. And some sort of emissions ratio always one of the required parameters in the calculation.
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They also measure volume of gasses emitted from the tail pipe and from that plus the ratio of emissions gasses they can calculate grams per mile or grams per HP.
If it were solely based on the ratio of gasses detroit would just pump fresh air into the exhaust instead of spending a grand on a catalytic converter.
And with this info as I have stated before, any leak in your exhaust system will benefit you on your emissions test.