Our BMW F80 M3 | F82/83 M4 S55 Intake Charge Pipes are the first on the market to feature a true 6″ radius. 2 1/4″ Aluminum piping for superior strength (no more cracked factory charge pipes), flow, and heat control. Available in Black wrinkle Powder coat.  Each set comes with the highest quality silicon couplers and optional T-bolt clamps for mild to high boost applications.