I have both on my 130i and very pleased with both.
I have a write up on the intake here -
http://www.1addicts.com/forums/showthread.php?t=298593
Also a video here, albeit in dutch, of a 125i with all the BMW Performance parts to give you a sample of the sound
http://www.bmwblog.com/2008/11/16/vi...-parts-review/