Kalil, good shots. You know what I ended up doing, though? I plugged the relay output and paid a muffler guy $50 to slice off the pipe with the flap, remove it and weld it back on with a small connector to keep the length right. No mechanical worries, now. Car sounds great.
2007 E92 335i . A52 . Steptronic . Sport . Premium . Comfort . Pilot Sport AS3 . Akebonos