I ordered the Atak with the E90 part number. Turned out it didn't fit very well, pipes went out too far. Sold it to an E92 guy, didn't quite fit there either, pipes a tad short.
I also tryed Borlas Sport. Again ordered for E90, perfect fit.
FWIW a quick review:
https://www.m3post.com/forums/showthread.php?t=1457106
Cheers