I bought the biggest filter I could find that woud fit in the stock location....I can't think of the part # for K&N, but the filters width is about 1" bigger than the intake diameter straight all the way down the filter...i think it's 9" long. i bought it at Summitracing.com

A1C Hodges, Christopher Active Duty USAF Sheppard AFB Texas;Westover ARB Chicopee, MA NECEG "Troll" formerly owned 2000 SVT Contour, with all kinds of goodies;)