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How do I add loudness?

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I like the quietness of the M5 for daily driving but occasionally I'll run the car in a local road rally in the non-competitive section. Then the car is too quiet!

Is there a quick and inexpensive way to make the car's exhaust louder that won't hurt the car and can be quickly and easily reversed? (I don't want to spend a fortune as I'll update the car soon anyway.)
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I swear taking out the charcoal filters make it sound louder & grunty.
 

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9,839 Posts
electronic mufflers.........they are out and expensive
 

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ggg --
You ever seen or heard this before? Does it actually increase power, or is it just sound? Would this significantly increase sound on our cars, cutting out the mufflers? Thanks
 
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