2004.5 lly duramax ran on the dyno at 2017 G&R dyno day
Mods
150 fass
Lbz cp3
Ported fuel rail fittings
Egr delete
5 inch mbrp factory down pipe
Mild built trans by nobles performance
Dsp5 tuning by ryan noble
Best of three runs made 485hp and 911ft lbs torque with 340k miles on the original engine.