" Salam AYF23,
A while back I had headers made for the e90 N52. When I did this I had the shop make one and only one set of headers for the e60 n52 motor. I don't know if they are the same part# on the F10, but let me know if you are interested. I can give you adapters that clear out the Check engine light too.
For the record, I have the n52b25 engine, which I am assuming you have. I made about 10whp and 10wtq with these, which is a cat delete based on the stock design.