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It doesn't make the exhaust sound manlier, it just increases the overall engine noise coming from the engine in the front of the car, so it just makes the car louder in general, but it has nothing to do with the exhaust. Long story short, open air intakes like AFE and Gruppe M are supposed to let more air flow to the intake manifold, so in theory more air equals more power. Also, they eliminate any resonating chambers in the stock intake system which makes the car louder. In reality though little to no power is gained unless you do a tune and other modifications. Lots of other arguments as well like how it can mess up your MAF and lets more dirt particles in the engine than stock filter.
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