Remove and replace the failed intercooler in your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax and get your vehicle back on the road. Intercoolers are equipped on many turbocharged diesel engines to cool down the charge air after being compressed by the turbocharger, before that air enters the intake manifold. You can get a factory-style replacement as well as an upgraded unit that provides you with increased durability for elevated boost pressure. You'll find top manufacturers such as AFE, Banks Power, CSF, XDP, and Mishimoto to choose from.