KKM on Ebay makes one for the V6 that I installed on my ST. The only thing extra that I did was I got some PVC pipe and relocated the filter down underneath the fog lamp. Just go to my library and take a look. If you have any questions, just let me know
Might be a bit less restriction but it doesn't look like much of a "cold air" intake.
I guess I'll just keep mine stock. I did put a K&N replacement filter in the '02 4.0 SOHC Ranger I used to have and it didn't make any difference in anything.