turbos are now under an 8/80 warranty. If you fall into that range go get a free set from the dealer. If not, there are a few bandaids but to be completely honest an 07 is going to rattle. Only way to truly rectify it is to replace them. Let me clarify though they might rattle but they have not failed, the turbos are still working, they are just rattling, and they will for years to come without trouble.
BMW master tech
2010 E92 335i 6-speed 25k miles. - For sale.
1989 E30 325i coupe 5-speed DD