The Fluidampr Performance Diesel Series Damper 830111 will reduce damaging engine harmonics in your 2006-2010 GM 6.6L Duramax LLY/LBZ/LMM truck. This viscous damper reduces the diesel chatter by removing torsional vibrations in your engine while adding 5.9 HP and 17.7 TQ to the rear wheels. Â