One other thing that I found out after pulling the plug was how well everything else worked on the car.
AC fan seems to blow harder (could be an illusion, can't prove this one)
Power windows are VERY much improved. The windows go up and down noticeably faster (This one is fact. No problem noticing it right off the bat)
Lights are brighter at night. Doesn't effect headlights but the interior lights are brighter.
Dashcam actually charges its battery for the first time correctly. I had a real issue on this one. First I figured I wasn't driving enough so I replaced the internal rechargeable battery which doubled its capacity. This made it go longer before reaching the dead point but still wasn't staying charged. After the ibs change it stays charged all the time now.
The wife's 535xi has a Chinese alternator on it (was on there when I bought the car) that the ibs can't deal with so it works likes its unplugged. This actually drove me up the wall on my original testing since my x5 acted stupid charging wise and the car worked great with the two being almost identical motor and electrically.
I'm not saying everyone needs to do what I did but I would suggest at least running the volt meter to see what is really going on for yourself. Then deciding if you want to try it. Its just unplugging a wire and if you don't like how it does then plug it back in
