Hello viewers, this video goes through the steps of replacing the failure-prone stock Silverado LML Duramax up-pipe and restrictive stock downpipe with an aftermarket setup. It's not too bad a job, but there are a lot of steps and approaching it with a certain sequence can save you some time and mess in your garage/shop. This video also talks about cleaning up plumbing in the engine bay to make your LML more reliable with less exhaust and coolant leakpoints. Thanks to @TruckMaster for the tip about blocking off the 9th injector feed at the bulkhead next to the CP4 by cutting the banjo bolt washer in half and using a standard bolt, that is a great idea.