Originally Posted by andrewwynn

For a preview pull out one of the post cat O₂ sensors.

Yeah not trying to put a damper on the thought of doing a proper replacement resonator just sharing a thought based on a YouTube video I saw recently and my own desire to pump up my wife's F10 muted exhaust.

She went from X5 e70 50i with the most amazing "exhaust note therapy" to almost Lexus quiet F10 exhaust.

You can hear the exhaust note on heavy throttle and it even sounds good. Just sounds much good-er on my X5 with the exhaust flap open.