The Garrett 886976-5004S PowerMax GT3788V Stage 1 Turbocharger is a performance replacement for the factory turbo in your 2011-2016 GM 6.6L Duramax LML. This turbo is engineered to improve performance while maintaining factory quality fitment and installation. With a forged fully machined compressor 65mm wheel and a 19% improvement in air flow, this turbo can support up to 600HP with supporting modifications.