In this episode of The Making Of, we take a look at Mishimoto's direct-fit oil catch can kit for the 2011-2013 BMW 335I / 335XI / 135I. We faced quite a few challenges when engineering this catch can kit, including a tricky heater on the intake side of the PCV system and a cramped engine bay. Take a look to see how our engineer, Jason, tackled these challenges and created this awesome direct-fit oil catch can kit!