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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.
Suddenly, CEL appears. Very rough idle, smell of exhaust when it is idling rough, hesitation, and at random speeds engine cuts out like you turned it off and then speeds up again. Codes are P0505, P1354, and random misfire codes for 2, 4, and 6. Car seems to run fairly normal until engine warms up.