Quote:
the resulting vehicle is identical (with regard to all emission related parts, engine design parameters, and engine calibrations) to a certified configuration of the same or newer model year
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Seems pretty unambiguous to me; the vehicle has to be identical to a certified configuration. That means engine plus chassis has to be something that the EPA and/or DOT and/or CARB has already signed off on.
More evidence of the "DON'T TOUCH IT DUMMY" school of thought for emissions testing regs.
-soD