Installing a after-market exhaust will Increase MPG and low-end and high-end power outputs. Also with addition to headers will come Increased loudness and Horsepower and low-end torque.
Headers help the engine breathe better thus better performance but the rest of the exhaust system needs to be included.
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They help the engine "breath" better.
Headers help to maximize exhaust flow which allows your engine to run more smoothly and use less power per stroke. Because of this headers can improve fuel economy but the change is very small.
Yes because it allows the engine to expelled exhaust gases with less restriction. If you keep your foot out of it you should notice 2-3 mpg increase.
They help with situations where you are trying to fit unusual or tight applications.
Headers, with free flow exhaust system will help.
The answer would be "No, you don't have to". If you installed exhaust headers to improve performance then you might consider if your current exhaust system compliments the headers. Headers are designed to help evacuate exhaust gases and minimize back pressure. If an engine has exhaust headers that collect into a small single muffler and pipe then the effort is somewhat defeated. BUT, if the headers are installed for the "cool factor", and there is nothing wrong with that, then go ahead and use the stock pipes or as much as you can.
I found this video that I think will help you with different headers. Please refer to this video and see if it's what you're looking for: http://www.woopid.com/view_video.php?viewkey=80425252
Borla headers are by far the best aftermarket headers available for performance cars and trucks.
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