i've got a K&N prefilter wrap that fits snug over my AEM brute force filter. being that i've got prerunner fenders i trimmed my fender liners so it didn't look like a$$ but now the filter is completely exposed to the elements, especially water. thought i should get one in case as to protect the exposed filter and the prefilter does just that as it is also water resistant. added benefits are that it improves your aftermarket filter's ability to filter microscopic debris by acting as another media and prolonging the need to even clean your filter. a prefilter wrap is so easy to clean, just pull it off and rinse off, done. you'll see the filter looks almost like you just cleaned it recently. at the CORR races noticed some of the trucks running the prefilter wrap. certainly works for them and works for me so i highly recommend getting one.