XDP Xpressor OER Series Reman GT3788VA Replacement Turbocharger XD556The XDP Xpressor Turbo (Remanufactured Stock Replacement) XD556 is a direct fit replacement for the worn turbo in your 2011 2016 GM 6. 6L Duramax LML. Issues such as excessive temperatures, over speeding of the turbo, a lack of lubrication, oil contamination, or worn seals can slowly cause damage to the turbo in your Chevy GMC. Common signs of turbocharger failure can include a significant loss of power, decreased fuel economy, noisy operation,