Akrapovic Exhaust Spring (P-S1 / 80mm) Akrapovic - The brand is synonymous with the highest level of design, performance enhancement and the creation of an unmistakable deeply resonant exhaust sound. Over 80 world champions have already relied on Akrapovic exhaust systems. And this is just the beginning of a long exciting ride. Replace lost or damaged springs. Stainless steel with rubber logo sleeve.