Milltek BMW F87 M2 Competition Equal Length Gpf/Opf Cat Back ExhaustThe Milltek BMW F87 M2 Comp Equal Length GF OPF CAT Back Exhaust range of systems is perfectly suited to cater to anyone looking to improve their sound and aesthetics. They are designed as a direct replacement for the original system, and available in multiple configurations enabling the owner to choose the increase in the volume of their exhaust and or add a more suitably aggressive tone. All our products are made from 304L Aircraft Grade stainless