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The advantage of "straight pipes" as opposed to a muffled exhaust is the lack of restriction. The engine is basically an air pump - piston down, air in, piston up, compress it and add fuel, ignite it, hot air expands and the piston goes down, piston up, air out, repeat several thousand times a minute. To increase performance you need to burn more fuel more efficiently, to achieve this you need more air to mix with the fuel, well you can't get more air in unless you can get more air out.
So the exhaust is the first step in performance gains, get the air out. Mufflers quiet the engine but they add a lot of back pressure and restrict the amount of air that can get out of the engine. Hi-flow mufflers try to maximize the amount of air you can get out of the engine with the minimum amount of sound. Unmuffled engines are extremely loud.

The disadvantage to straight pipes is that they are illegal for road use anywhere on the face of the earth. They are for track use only. If you are going to track the car, this is the exhaust for you. If you are going to drive it on the street, no. Get a good tuned exhaust system like a Tubi that will balance your car on that fine line between cool street performance and obnoxiously loud bad neighbor.
 
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