All Capristo valved exhaust systems utilize our proprietary 80mm valve diaphragms. Capristo recommends to always replace the Valve Diaphragms in pairs in the event you have a failure. The Standard-Length Arm fits the vast majority of Capristo systems. The Long Arm version fits R8 Gen2, Huracan, and Aventador SVJ. If you are unsure which version you need, please contact to clarify before ordering. The valve diaphragm is a critical component of the Capristo valve mechanism, controlling the opening and closing of the exhaust butterfly valves via vacuum actuation. Over time, diaphragms can harden or develop micro-tears due to prolonged heat exposure — replacing them restores proper valve function and the signature Capristo dual-mode exhaust experience. Genuine Capristo replacement part. Sold individually — Capristo recommends replacing in pairs.