PLM Active Exhaust Valve Motor Bracket Simulator - Mustang GTIn Stock! Made in the USA! PLM Active Exhaust Valve Motor Bracket Simulator 18 23 Mustang GT If you run a PLM exhaust or other aftermarket exhaust on your active exhaust equipped 2018 2023 Mustang GT, you will need this Active Exhaust Valve Bracket to mount your factory valve motors in order to prevent a check engine light CEL. Simply remove the valve motors form the factory exhaust, and mount it onto our simulator mounting bracket, and secure it to