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Sound. Every exhaust system or muffler has its own unique sound. You can add a Magnaflow muffler to your exhaust for a pleasing, slightly louder-than-stock tone, or you can get an aggressive growl out of a glasspack Cherry Bomb muffler.ufflers. If your exhaust system ended at the catalytic converter, your vehicle would be obnoxiously loud and noisy-far from the high-performance growl you know and love. As their name implies, mufflers reduce the noise coming out of your exhaust to less-than-deafening levels.
1 Smokey Diesel Engine on Startup-Not unusual to have a smokey diesel on startup-especially with older engines. 2  Smokey diesel engine on acceleration, is normally a sign of either cold engine, worn injectors or a fuel issue. ( 3 It is also quite normal for even the best of diesels to emit black smoke upon acceleration!).he first thing to check with a smoky diesel engine is the air filter. If this is dirty or clogged, then insufficient air is being sucked into the system to allow the diesel to burn properly-result = smoking engine. Take the filter off â it wonât do any harm for a short period of time. Rev up the engine.