Boost gauge, Manual Boost Controller, NGK BKR7E spark plugs (one range colder), Protosport Down pipe.
Most people don't recommend MBC's anymore because there have been a few blown motors. But I'm still boosting higher then stock (10psi) and will continue to do so regardless what others say. Other people arent going to dictate my level of lifes enjoyment! And I really don't car if Mazda NA or any other Mazda employee surfs this site. It's my car, I paid for it and I'll do with it what I please.
Welcome to the community!