MBRP GM8428 3" TURBO DOWNPIPE 2015.5-2016 GM 6.6L DURAMAX LML The MBRP GM8428 3" Turbo Downpipe for your 2015.5-2016 GM 6.6L Duramax LML. Removing the restriction in the factory downpipe results in lower EGTs and increased performance. The down pipe is relatively easy to install due to the precision bends that youve come to expect from MBRP. FEATURES: Richer Diesel Sound Greater Heat Retention Gains of +21HP & +24 Ft-lbs. 20% Greater Flow Over Stock Will Not Affect DPF or Urea System Note: This Downpipe is designed for the 2015.5+ model trucks with the 3-bolt flange style connection. Not available for sale in the state of California Not available for sale in the state of California.