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F10 550 front resonators removed with OEM M5 Mufflers
Here's a clip for anyone interested in this setup. I didn't want something too loud so this is what I ended up with. I removed the front cylindrical resonators and replaced with straight pipes. I kept the square resonator at the rear and swapped out the OEM 550 mufflers with OEM M5 mufflers. The vacuum system is unaffected. Just hook up your lines to the new mufflers and the valves work as before. In my opinion this is what it should've sounded like from the factory but BMW wanted an "executive sedan." Boring. It has a nice rumble when cruising and comes to life with a roar when you get on it. There is NO DRONE whatsoever even at cruising speeds and throughout the RPM range.