Found this on kam racing:
Part K2.65 is the standard air filter supplied in the Green forced induction kits and our own Raceland + Greeninduction kits. It is a conical airfilter substancially larger than the Raceland / Simota one.
Part B2.65 is a cylindrical version of the K2.65 Green Air Filter with a larger surface area.
Part K8.65 is a conical Green air filter larger than the basic K2.65. Larger than even the B2.65 it is flows substancially more air with little restriction.
Part B8.65 is a cylindrical version of the K8.65 Green Air Filter with a larger surface area.
Part B2.65BC is a twin cone version of the B2.65 and is the largest Green Air Filter than can fit within the Raceland / Simota enclosure. Not only is air drawn from the outer circumferance but also from the 2nd filter in the nose giving unmatched performance for its size.
All the above Green air filters have a 65mm internal diameter and an angled flange for a perfect fit within the Raceland and Simota enclosed induction kits
Is it possible to get one too big?
I'm thinking of getting the B2.65 filter. Any1 else have it on theirs?