How to Install the Agency Power OEM Exhaust Valve Delete Box
This guide is to help with the installation of the Agency Power OEM Exhaust Valve Delete Box on the 2016+ Ford Focus RS.
Step 1. Locate the OEM Exhaust valve module at the rear of the exhaust system next to the driver side exhaust tip. Disconnect the valve and remove the 3 nylon locking nuts securing the valve to the factory exhaust.
Step 2. Align the OEM Exhaust module up to the new Agency Power Exhaust Valve Delete Box. Ensure the spring is seated properly in the groove and attach using the supplied hardware. (Product shown in images may vary from actual product)
Step 3. Re-attach the wire connector and use the provided hardware and existing holes to mount the Agency Power Valve Delete Box to the underside of the vehicle. 
Now with the Agency Power Valve Delete Box installed you can now enjoy your exhaust system without loosing any functionality of the Focus RS’s drive modes.
Can this unit be installed with the OEM exhaust still in place? I am tired of not being able to select drive modes because the valve gets hung up in the exhaust.
Yes it will work with the OEM Exhaust, but keep in mind that when the electronic valve control module is removed from the OEM exhaust the valve may not remain in the open/closed position.
Will this work for mustang ecoboost active exhaust 2019?
We are unsure on fitment, as we have not had a 2019 mustang to test it on yet.