[cornflakes]

(08-18-2014, 10:52 PM)ZTWsquared Wrote: Think of it this way - you don't really have a dual exhaust - what you have is two single exhausts, only one of which is used at any given time, depending on the position of the valve.

With the valve closed, the exhaust is routed through the side with the muffler - and so the sound is, well, muffled and therefore quiet.

With the valve open, the exhaust is routed through the side without the muffler, and therefore is louder.

Agreed, and that's totally right. Actually, the 2nd piping is not welded on BEFORE the muffler. I'll have to take a pic again and show, but it's welded into the muffler along with the original pipe.

So the 2nd extension pipe is coming out of that muffler also. I just wish I could study the science behind how it works. Also, when the valve is closed, the left side that goes through the muffler is still pretty loud. I always leave it closed anyways because it's REALLY LOUD when i open the valve, although it sounds very nice at idle or low rpms.

Why does the left side still sound loud even when the valve is closed and so it's running through the original piping and muffler.

Is a bit of the sound still resonating from the 2nd pipe even though the valve is closed? When I said that it's quieter, I meant comparatively to the when the valve is open. It's still A LOT louder than stock even with the valve closed. It's just a stock muffler and stock piping....again...is this ALL due to the 2nd extension piping alone?

It's quite interesting.

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Here's a short clip i took of driveby when driving with valve closed and then open.
Valve closed and open