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Originally Posted by tylerk So are you saying that for a DD, you would recommend keeping the stock exhaust (non-nismo touring sport) as apposed to upgrading to say a Fast
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A True Z Fanatic
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Example: Our car's stock exhaust is a coffee straw. 2.5" exhaust is a regular straw, and a 3" exhaust is a water hose. Blow through the coffee straw and sure you get velocity, but there is a lot of back pressure. Blow through the regular straw and we still have very good velocity, but we also have much less back pressure. Blow through a water hose, the size of the hose is so large, there is very little velocity and no back pressure. It's too big to be efficient for the application.
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A True Z Fanatic
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The power gain you are going to get by replacing the stock exhaust is in the muffler section. OE mufflers tend to be very restrictive because they have multiple baffles inside slowing down and quieting the exhaust. Aftermarket mufflers are typically less restrictive and offer a more "straight through" exhaust flow. Hope that helps.
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