Mishimoto Performance Air Filter, 3" Inlet, 6" Filter length by Mishimoto If you are looking for a replacement air filter for your Mishimoto Intake System, you've come to the right place. Fully cleanable and reusable, Mishimoto Replacement Air Filters provide superior filtration and optimal air flow. The part number for this item is MMAF-3006 and the inlet diameter is 3". The filter is 6" long. Please measure your existing filter before ordering to make sure the measurements match up with this replacement filter.