I have a new/old '97 4 banger TJ and need to replace the air filter. It has a oil based one now, but the Fram replacement (not oil) just rattled around in the filter box. I thought it should fit snugly. So I took it back to the 'all knowing' parts store, but they had no clue. Help Please. Is a paper replacement OK? Should it rattle around? or should I upgrade to a K&N? Does the K&N help perf? I've heard mixed opinions.