Our BMW F80 M3 | F82/83 M4 S55 Intake Charge Pipe 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 Polished Aluminum, Satin Black Powder coat and Gloss Black Powder coat. Each set comes with the highest quality silicon couplers and T-bolt clamps for mild to high boost applications. Meth bungs are also available as add on option at no additional cost. Made in the USA