An injectors are more of a wear out over time thing, unless one gets clogged in some way. Have you replaced your fuel filter recently? As for the muffler thing, just cut them off, these engines sound great opened up. No black smoke with no boost means no fuel. If the injection system is working correctly and the turbo was faulty, you would have black smoke because the turbo isn't supplying the extra air to clean it up. Have you checked to see if the hose has come off/torn from the manifold to the AFC housing on the injection pump? That refrence hose allows the injection pump to supply more fuel under boost, and if not connected you will be limited on fuel flow, though I don't know if it would be to the extent you are experiencing.
Above all (this should probably have been listed first) don't waste your time with the "head gasket in a bottle" crap. It will clog your cooling system and wont work on the gasket. A diesel engine has WAY too much compression for that kind of a repair to do anything. Maybe on a half worn out old 350 v-8 with no compression and a slight hg leak it would work, but not on a diesel. Before you waste much time troubleshooting anything on the engine the head gasket needs to be repaired. These engines depend on compression to run correctly, and a blown headgasket screws everything up. You should think about using the updated stainless headgasket, or the stocker with headstuds to help keep it sealed up if you are going for performance. If staying stock, make sure to use new bolts anyway.
Jason
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