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The metro EGR system would be reasonably easy to bypass without having the computer throw a fit about it on OBDII cars, OBDI could be bypassed using the following method without the computer caring at all.
If you look on the intake manifold drivers side there is the EGR valve. Follow the hose from it to a round thing with another thing right under it with some wires that is clipped in a holder right beside the valve cover. That is the controller that uses a PWM signal to regulate the valve opening. From there the hose runs to the throttle body.
To make it run full on just take the hose from the EGR and run it straight to the throttle body leaving the PWM valve hooked up to the wiring. The computer will be more or less happy and still think it is controlling it. At least until you get a O2 sensor error or cat converter out of range error after a few hours. But at least for a simple A-B-A type of test that is all it would take. If any useful data comes out of that then trying to figure out how to permanently modify it would be worth looking into.
I don't have enough of a working EGR system left to test it out on my car so I guess this is something someone else will have to test.
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