Loud exhaust explained

For years I have had loud exhausts on my cars. Not just for wonderful grumbling sounds, but for the added efficiency. Yes, a loud exhaust makes your car MORE EFFICIENT.

But it sounds like one of those race cars, and God knows those things just drink fuel.

Be that as it may, a quiet exhaust is far more restrictive. Allow me to illustrate:

Yell. Scream. It can be loud, right? Now try to scream with someone smothering you with a pillow. It's much quieter and it's hard to breath. That's a similar principle behind a muffler. The science of quieting engine sounds is a factor of restriction. An extremely restrictive exhaust will lower the noise level. Picture trying to breath through a hose, and someone squeezes it down. Air may pass, but not as easily. This will make an exhaust quieter at the expense of breathability. That's why they make all kinds of high-flow exhaust kits for about every car in existence. Wider diameter exhaust pipes and less restrictive mufflers increase noise levels but allow the car to breath better due to reduced BACK PRESSURE.

Reduced backpressure WILL yield better gas mileage and greater horsepower. In some cars you can unlock up to 50 horses just on exhaust alone, and your trips to the gas station will be less frequent. Any questions?