With a piggyback controller.
How would you meter the fuel effectively on a naturally-aspirated car? It seems you'd run super-lean for a fraction of a second before the extra fuel had time to mix with the incoming air due to the very short length of the intake tract on many naturally-aspirated cars.
Also, you'd run into plumbing issues on cars there is no turbo aftermarket for, or that have sensors mounted in the throttle body.
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2012 Chevrolet Cruze Eco 6MT
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