Originally Posted by iceguju

Do exhausts make that much of a difference in performance? I am looking to add some minor performance mods on the G as well. I currently have a Z-tube with Stillen cold air box. I am buying the MD 5/16 copper iso spacer in the next two weeks. Would the intake along with the MD spacer provide a little bit more response to the car or will I need an exhaust as well? And whats the purpose of getting the Stillen ground kit? I am a noob at the performance mod aspect of the G35. Thanks team work for starting this thread. Thanks to everyone else for providing input.