Here is what I did on my F45 2015
1- turn on car ( don't start)
2- select sport mode
3- Floor the throttle pedal
4- Turn off car
5- go under the driver side exhaust and disconnect the wire that controls closing and opening it
6- tape things up just to make sure no water or anything goes in and secure the hanging wire
7- you will have both exhausts open in all modes and louder exhaust too!
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