EGR moves exhaust gas back into the intake to be burned for emissions.
on my 4g 93 mirage, i had a 3g manifold that was not cast with the EGR on one of the runners. i also had to put a potentiometer and resistor at 12.5.... something to emulate the EGR temperature sensor.
no adverse affects, except a squeaky clean intake manifold and throttlebody
if you install it, you just wont be moving the exhaust gas back into the manifold.
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