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If you switch to a UNI filter you cannot run an outer wear. They use a different oil than a K&N. if you use an outerwear on a UNI it will soak up the oil and won't let the motor breath.
Air filters are another "black art", I guess it depends upon what your are doing with your machine, mine is purely a competition use and that requires slightly differing air filter set up to a recreational machine.Its al about air velocity, the manufacturer of your engine had an airbox set up in a specific way. To get the very best out of it you need to do something a little similar.In my case that mean bell mouths (trumpets) on the carb inlets encased in an aluminium air box with at least 50mm of clearance at the front of the trumpet. The air box can then have any filter you like.The issue is air has "fluid like" tendencies and mass, it doesnt like to change direction once its moving and it doesnt like getting moving if its stationary. Therefore a smooth approach to the carb or throttle bodies is required (the trumpet) and no sharp radiuses immediately before the trumpet (hence the 50mm min clearance at the front of the trumpet).For rec use, plant the filters immediately in fron tof the carbs or throttle bodies and adjust your fuel to suit, for racing use (using all available ponies), you need to do a little more work..... aint it fun??