They do in-fact manufacture a drop-in filter. I was even able to purchase it at Advance Auto Parts. For reference, it's the same model number as the K&N Drop-In Filter for the 2.8 CRD in the Liberty.
-As far as performance, etc. you can hear the turbo sucking lots of air, though it equates to muffling the sound of a vacuum cleaner and hearing the air rush through the hose (i.e. VERY RESTRICTED).
I can't say that I've observed any noticeable difference which I equate to having only 7k miles on my engine thus far. K&N states that the dyno-measured gains were 6hp and 6tq.
I'm averaging 20mpg city and 20mpg hwy.
Last edited by ----; 02-27-2008 at 08:58 AM..