[cornflakes]

Hey guys, I'm just curious about a little something.

I bought a used car and the car normally has just one exhaust tip on the left side (stock models), and mine is still stock but the previous owner looks like they made a dual pipe via welding another piping to the main pipe just BEFORE it enters the muffler. So instead of having one exhaust tip on the left side, I have another exhaust tip on the right side giving it that dual exhaust appearance but really it's still just a single pipe.

Now this extension pipe that goes to the right side, near the exhaust tip inside the piping is a ELECTRONIC VALVE. It can open and close with a push of a button.

I keep the button on so that the valve is closed, less noise but still louder than stock. But if I release the button, the valve opens on the right side and then it gets really loud.

The car is stock, it's not a special aftermarket catback or muffler or even larger piping. It's just a welded on extension pipe that goes to the right side and has an electronic valve that opens and closes for sound effect.

All I want to know is WHY does it make a louder noise? Can someone explain the physics or mechanics of how simply welding on another pipe (before the muffler) to extend out to the right side rear of the car makes the car sound much louder than without it?

Is it because the newly extended welded pipe has no muffler? The left side has a muffler and then the exhaust tip but the right side is just piping.

I'm just really curious as to where the noise is coming from and how does it make that noise?

Here's a pic that might help show you what I mean:

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sorry, actually the extended muffler that goes to the right side is welded into the muffler on the left side. The main piping (thinner one) also goes into the muffler..that's the original piping. The newer extension one looks like it's a bit bigger in diameter maybe a 2.5"? and the stock looks smaller like 2".