total BS. anyone with even a basic understanding of efi will understand that a groove under the throttle plate will do nothing to the idle (compensated for immediately by the idle air solenoid) and will have zero effect on mixture (immediately compensated for by the ecm). no effect on atomization either, as it's too far upstream to even see fuel. Looks to me like some here may have a vested interest in this scam. most likely make millions from the deal if prior similar scams are any indication.