Before you buy a K& N air filter, you should check out a filter that is starting to get a lot of use by us TDR members. The NAPA part # is 2790, and Fleetguard # is AH19037. This filter replaces the whole filter box. It has more filtering surface, and Big Daddy tested it on the dyno and gained 2 horsepower. I saw some pictures on here somewhere, but don't remember where. The cost at my local NAPA is $47. 00.
Ron