first you say this:Then this:You seem to contradict your own statements.

 

It depends upon the type of muffler. Some just dump in the right so the easiest path is out the right tail pipe. Some force the exhaust over to the left and then that is the easiest path.
The point was that the restriction is there to balance the exhaust flow so that when there is steam or any visible exhaust it'll look even like it has real duals on it.

The SLP dual dual is a very good muffler and you will not find any gain in taking this "restriction" out. All you will gain is when you stomp it you'll get a blast of exhaust out of the left and nearly nothing out of the right. And the car will be a little louder.
Just like the Borla. People have dynoed with each plate from the 3/4" to the wide open and found no gain.

 

I have no hopes of gaining any noticable power by doing this, but rather sound.
There is a noticable difference in the sound and volume of the exhaust. that is why they installed the ring in the first place, to reduce the exhaust volume to meet the federal regulations or what not, so by removing it, is just making it louder.
I see it like this: i paid $20 to have this removed and got a louder exhaust note which is what i wanted. that just saved me several hundred dollars i could have spent on a catback to do the same thing. Its not as loud as a borla or anything, but it has satisfied me.

 

Sweet you got what you were going for from a cheap mod. Doesn't always happen.
There's another cheap mod that you can do too. You can cut a hole in the i-pipe and in the right hand tail pipe (the 2 holes would be facing each other) and put a small pipe (3/4"-1") between the 2 letting some of the exhaust out the right hand tail pipe without going thru the muffler at all. This is a mod that was being done to LS1 f-bodies before all the catbacks were available.

 

Who keeps their factory exhaust anyway? You need larger pipes to make any kind of gain-- catbacks aren't just for sound.

 

keep in mind were talking about teh slp dual/dual which is 3" and is available for aftermarket purchase. i woul have to agree on the factory Z exhaust.

 

You really think that there's a huge difference between a 2 3/4" mandrel bent stock pipe and a 3" aftermarket pipe on a stock or near stock motor?
I don't. I believe that most gains form catbacks are in the muffler.
Now once you start modding heavily, different story.

 

Yes, I do. I've seen the gains people have made just from switching out factory exhaust for a cat-back.

 

What he is saying is, is that the power is not in the piping its self, but more in the muffler. Basically stating that 2 stock cars, one with a SLP muffler and stock piping and the other with a SLP cat back, won't make any noticable diffrences between each other.

 

Yep that's what I was going for.