2014 fuse pull. Look at pix please.
 

Gm replaced my exhaust with the same. Brand new. Since they swapped exhaust the fuse was pulled so that all ports are always opened. Well please look at pictures and tell me why there is no carbon build up on one if the ports on each side. I read a bunch of threads in here about how it is louder. Well yes it is but even a little carbon on one of the ports should have a little bit at least do I put the fuse back in??. Im confused. Thanks for the help.

Pix

Can you see if the butterfly valve is open? It should be open all the time since you pulled the fuse.

I had the same question when i first got mine,thats normal.I was told that,that is cause thats the main exhaust escape.

I dont even see a butterfly on the inside ...the clean one.. the outside you can see it open

Well. I guess that could make sense. But its like band new still. Had fuse pulled for 600 miles. Never wiped

Its one or the other not both.

Open = the path to the outside tips is used.

Closed = the path to the inside tips is used.

You can look down the outer tip and see the flap.. When the flap is closed the exhaust is diverted into the muffler instead of straight out.

Exhaust gases travel thru the area with the least resistance. That's why the flat acts as a diverter.

Ahhhh. Thank you. So why do I have an upgraded quad factory when all I had to do is do a muffler delete with single pipe. Do all 1le have quads or this an any car option.. thanks!!

Just FYI that second pic is the valve and it is open. Like others are saying the dirt probably just shows up more on the main pipe.

The npp is for people who don't always want the sound. Yes if you planned on pulling the fuse a muffler delete or different cat back would be a better option probably. But if the wife or kid get on your case about the noise pop that fuse back in and everyone's happy. That's why I like it

Is this thread for real?

^ I was thinking the same thing.

I forgot what it is but something causes more resistance on the inner pipe.

This is 100% normal.

I don't think this is correct,

Open = both are open, however the majority goes out the outside pipe because its the path of least resistance

Closed = outside pipe is closed.