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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.
As such, original equipment car exhaust systems tend to be muffled and restricted. This reduces the engine's ability to make more power. A free-flowing car exhaust helps other bolt-on upgrades, such as a cold air intake, perform better. More air in equals more exhaust out, sending more power to the wheels. Stock car exhaust systems tend to be heavy and restrictive with relatively small outlets. Thanks to advancements in muffler design, you can now choose what kind of sound you prefer and even how loud it is. Throw a MagnaFlow performance muffler on there and check out the sweet rumble you get when you put your foot down.