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How about an electric air injection pump off a new car and an rpm switch that turns it on under 1500 rpm?
A lot of new cars have an electric air pump. RPM activated switches are pretty common a lot of people use them for their nitrous systems and can be had new for under 50 bucks. Used is much cheaper if you can find one.
You might even be able to pass visual inspection since it still has an air pump, not sure how they do it though since I have never seen an emissions test done.
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