Your Warranty with an Exhaust Brake will depend on the dealer that you have your warrany work done at. Some dealers are actually selling these items. Also another reason for a Banks Brake as they will go to bat for you if necessary.
I talked my local to my local GM Service Manager regarding exhaust brakes. He related some recent antedotes where exhaust brakes were blamed for a couple of '04s sucking valves. One the one hand if there is a problem which is attributable to any after market stuff that I install, I am on my own. On the other hand, they won't show me the door just because I have made some mods. Fair enough. Of course the plot will thicken when the cause of a problem isn't clear. But that comes with the territory.
BD (and I assume Banks) monitors back pressure and releases the brake to conform to GM's specs. I assume that this is what they are working on to make right. With an LLY in my drive and a BD sitting on my bench waiting for install, I am trusting that they will work out a solution and get it right. They have told me that the brake that I have will not change but will require the adding of a control module. So, in the meantime, I am going to install it along with the 4" exhaust system that is going in. I just won't hook up the electronics.
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