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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.
How to identify what octane your car needs: 1  First, open the fuel filler door. 2  Next, look at the gas cap and the inside of the fuel filler door. 3  The typical way the recommended fuel octane is listed is as follows: XX Octane (sometimes âAKLâ is put in place of octane) recommended.