Thanks for the link, very informative. I'm going to make an attempt sometime next week.
About the exhaust tips: I ordered the OEM shadow tips from BMW but I seem to be having trouble taking off the stock tips. I was advised to simply pull them off but so far I have found them to be very resilient and they just refuse to come off, which leads me to wonder if I'm doing it wrong. Please let me know if you manage to pull it off (pun intended) and maybe share how you did it.