Other than making it sound louder?
In: Technology
Combustion engines need air, fuel and a spark to go boom and make power. After the boom the exhaust has to go away so more air and fuel can go into the cylinder to boom again. (Suck, squeeze, bang, blow). Larger exhaust improves the blow portion.
A larger or dual exhaust speeds up that last part. It doesn’t really need to be dual, but two small tubes= one big tube when you can’t fit one big tube under the car/truck. Also allows flexibility in how you move the byproducts (heat) of the exhaust.
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