I've got a K&N Typhoon intake on my 07 ZX4 with a MBRP exhaust and it has a little more pick up with just that .
Later on when I added a tune and then header I noticed some more pick up too. Then the final addition was a bigger throttle body .
All those combined with a tune you can really tell a difference response wise.
Team Duratec #01,Sedan Revolution#4, Elder FocusedSlayer, Gump Crew 21
February 2012 Sedan of The Month