Capristo Bypass Exhaust Valve Kit - Ferrari 355Ferrari 355 Exhaust Bypass Valve Kit This CAPRISTO exhaust bypass valve is engineered to correct known failures of the OEM valve, which commonly fails in the closed position causing excessive exhaust back pressure and heat damage to the engine and or exhaust headers. In the event of a vacuum or electrical failure, the CAPRISTO valve is designed to default to the open position, relieving back pressure and protecting critical components. The kit