You do notice it a little bit power wise but it really makes a difference with a tune and other power modifications as the N54 bottle necks at the intake. It also has more induction noise. We sell aFe products as well. Also, if you are in that area you might as well replace the charge pipe before it pops off. The OEM plastic piece is pretty poor.
http://hpashop.com/category.sc?categoryId=268
-Tyler