Charge Pipe Kit for BMW 335i 335xi 335is (2007-2013) Turbo OutletDelete the most restrictive part of your N54's boost system and finally let those turbos scream. High Flow Aluminum Turbo Outlet Charge Pipes for 2007 2013 BMW 135i 335i Z4 (N54 Twin Turbo) If you are modifying an N54, you know the struggle of the factory "pancake" pipes. To fit the twin turbo setup around the steering rack, BMW crushed the factory turbo outlets down to a restrictive sliversometimes less than 1 inch in diameter. This creates a massive