i dont see how having just an aftermarket muffler will make the car sound bad. when i first got my alero, i installed a borla muffler, mainly because i couldnt afford the entire exhaust system being redone,and i also planned on getting a header(2.4), and didnt want to have to go to the exhaust place more than once. that was a couple years ago, and ive still got just the muffler (still have more important things to pay for than exhaust), and it sounds quite good. i also did notice a slight performance increase, whether or not it is in my head, i dont know.
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