Well I know you are talking about the Valve/Tube plugged into the exhaust.
All I did was plug it up with a screw or you can with a Golf Tee
and the wrap up the tube and zip tie it so it does not hang down.
You should not have any problems at all.
08 BMW ///M5 Space Gray/Black 6 speed
Engine: RPi GTS exhaust, RPi Scoops, Carbon Filter Delete
Exterior: Glossy Black Kidneys, LUX V3, OEM LED License Plate light, Bruce License Plate Adapter