This optional upgrade from Milltek Sport enables existing Axle-Back exhaust system owners to convert their setup into a full Cat-Back system without the need for cutting or extensive modifications. - Converts Milltek Axle-Back system into a full Cat-Back setup - Allows Axle-Back to be installed without cutting the factory exhaust - Precision-engineered for direct integration with Milltek Sport systems - Ideal for staged upgrades or non-invasive exhaust installation