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One of the easiest modifications to almost any car to gain both horsepower and fuel milage would be to make modifications to your exhaust- you can pay a custom exhaust shop to make you a cat-back exhaust system, or you could simply buy a high-flow muffler and install yourself- you should gain possibly 5-10 hp and possibly 1-2 mpg.

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Q: How can you improve your cars performance without hurting gas mileage?
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