Originally Posted by Dark_Knight_335
Waste gate? At 9700 miles?
Definitely sounds like wastegate rattle to me. I've listened to a lot of videos in search of a solution for my problem, and every wastegate rattle video sounds like what you are hearing/showing us. Give this link a look: https://www.google.com/#hl=en&tbo=d&...w=1187&bih=781
You'll see that just on e90post.com alone there are a lot of issues with wastegate rattle in the N55 engine, and the N54 for that matter, and there was one or two accounts where the rattle started under 5k miles.
If your dealer is worth their salt, you _SHOULD_ be able to go in and tell them that your wastegate is rattling and you think it needs tightened or replaced and they should do it no questions asked. Also, Dinan is a BMW approved so you shouldn't have any issues with them yanking ya around on warranty work.