Which Dual exhaust improves my performance and yet doesn't lower gas milage.?

Question:
I drive a 2004 3.9L V6 Mustang..

Answers:

What should the timing be on a chevy 383 motor?

none should affect your performance or gas mileage in a negative way because your releasing more exhaust from your engine so better performance and mileage

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I have a 2001 Ford ranger 2wd ext.cab w/3.0lt. Needs a htr core and 1 shop says 6hrs. labor 1 says 10. ripoff?

flowmaster

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99 Wrangler heating and A/c fan contols only work on two speeds?

all i have ever known of increase performance and fuel economy...you get 2 benefits for the price of 1

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How do I change the shifter knob on a 2006 Chevy Silverado?

Your probably gonna be wasting your money, because the improvement wont be very much if any at all. If the car needed it, it would have come with it. Just get a larger single exhaust pipe.

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Jeep Speedometer and Gas Gauge Problems?

none of them if you get a louder exhaust you will be stepping on the pedle to hear it more

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