[NRG]

Originally Posted by cstavaru

But you forgot this interesting read which shows nice gains on Helene:

http://www.e90post.com/forums/showthread.php?t=132028

If you do a long search, you'll find a lot of info on drop-in filters in the first year production of N54 (06,07), since no other intake options where available at that time. The real world gains are minimal to none on almost all of them. The thread from "hotrod182" proves that clearly!