Maximize the output of your 2011-2016 GM 6.6L Duramax LML with the Garrett PowerMax GT3788V Stage 1 Turbocharger Upgrade (886976-5004S). This direct drop-in performance upgrade is engineered to outperform the factory turbo with a 65mm forged, fully machined compressor wheel that delivers 19% more airflow than OEM. Supports up to 600 wheel horsepower with supporting modifications while maintaining factory installation fitment � no fabrication or custom plumbing required. A genuine Garrett upgrade that pairs OE reliability with serious performance gains for towing, daily driving, and high-output builds alike.