More weight savings and sound improvements are achieved with Akrapovic Evolution systems. The Evolution systems replace the stock exhaust system from the manifolds / catalytic convertors back. The Evolution performance exhausts transform the car from being mild mannered into a true GT1 racer with a deep tone and aggressive sound. Complete the look with a set of exquisite 115 mm or larger 125 mm tailpipes in either titanium or carbon fibre. Select the optional Akrapovic sound kit for adjustable sound.