Ummmmm, what exactly do you have in mind? Removing the airbox and replacing it with an open element filter? I can tell it makes no difference in performance, just lower the intake temps a bit and maybe helps the turbo spool just a little bit quicker. It makes a big difference in noise, you can really hear the turbo whistling and the bypass valve uuhhhhhh.......bypassing. :cheesy: Though I don't know how loud it'll be on a regular 2.3L.