If you want the exhaust valves open 100% all the time:
1. Remove the valve actuator on each side by removing (3) 10mm screws on each.
2. Manually open the valves to 100%.
3. Reconnect the actuator but makesure the spring is not sitting in the groove that opens the valve.
4. Remove exhaust valve fuse in rear fuse box.
I've done this to both my M2 & wife's X3MC. Takes about 5 min & costs $0
