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Old 02-13-2013, 09:41 PM   #4
Reverse Gear Member
Join Date: Aug 2011
Location: Oakville
Posts: 1,109
As far as the website says, you only need the tailpipe test...

"Drive Clean will continue to use a tailpipe test for light-duty vehicles from 1988 to 1997 model years"

Not sure why they put you on a dyno. I did mine last year too and they just stuck the probe in the pipe and revved it while stationary.
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