I emailed them about adding their MK45 mufflers to the M3W and they said they had done it but suggested extending the headpipes further to the rear because the muffler exit was a bit loud for the proximity to the ear.

I sure like the way S&S does things. Quick response to inquiry and responses that help you further your desire to modify, even if it is not with their parts!

They suggested Garage 56 for an ECU that could be tuned if a person was to add cams and intakes as well as mufflers. Nice of them to come up with the workaround.

2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)