First, you can just take off your muffler but if you do that, you will be called a "ricer" which is basically saying you're a loser and a wannabe car modder.
Second, you can buy a cat-back system which is a whole new exhaust system from your cat, all the way back to your tail. This will take some money from you but it will actually help your performance (a little bit, might not even be noticable) and you won't be called a loser by real car modders.
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