Does a Magnaflow dual-in dual-out muffler with the "Tru-X Perforated Core" serve to replace an x-pipe, or is an x-pipe still needed ahead of the muffler?
And if an x-pipe is used (ahead of the muffler), does it provide a 'double x' in the system?

See magnaflow's site for example on a tru-x:
http://www.magnaflow.com/02product/s...ne=main&id=487

The specific magnaflow I'm considering using is the 12468; although it doesn't say 'tru-x' on magnaflow's web site, it is tru-x.
(I can get one from a friend for very low cost, if I want it).

Any experience using such mufflers? This is definitely lower cost than two separate mufflers. And yes, assume dual piping will be used from the cats-back.

 

Yes, I had that exact muffler on my previous 2000 5.3L ECSB Silverado.
No performance gains could be felt. It was also on the quiet side. It was quieter under WOT than 1/2 or 3/4 throttle.
I didn't like it.
I had true duals all the way to that muffler. In two, X chamber, then out two.
It does serve it's purpose as an X-pipe or pressure equilizer between the cylinders, but it would be a lot better to have the X-pipe section as close to the engine as possible, but not before the cats.
The best gains would be using two high flow cats (if you want to stay legal), a X-pipe, then two mufflers of some sort.
Good Luck!

Jim

 

I guess I should update my sig.. have headers and high flow cats, temporarily hooked up to the stock Y and muffler. I've got the xpipe and other peices needed for full dual, just haven't got it on yet.
The original plan was to use two separate mufflers, with an x-pipe in the system where the stock Y would be. I elected to go full dual because other mods will be coming and I want to go ahead and get the exhaust right the first time (sure, I could use the stock Y with a high-flow muffler, but I don't want to do that).

I realize the muffler linked to in my previous post is the larger, longer one for suv's; I wouldnt use that one anyway, but a short, 18" long one.

I might pass it up and go for individual mufflers.

 

ok here is my truck now way to loud.


I have sw headers with some random tech 3 inch cats. So 3 inch duals coming frmo the headers to the single in singel out magnaflow.

i talked to magnaflow and said i want the maximum flow but quiet her down some and they told me that the muffler i got which is this one the 5x11x22 with internal x pipe


will quiet it down some but since im running long tubes and small 3 inch high flow cats it still would be loud. Ill be running dual 3 inch in and dual 3 inch out exiting in the back of the truck. I didnt want to get a additional x pipe and run 2 longer mufflers because that would just cost more money and take up more space. i hope to have it in all next week. there is a member chase that has this same muffler and his silverado ss is still loud. they also told me that the 3 inch dual in/out is a jump on sound over the 2.5. the dual 2.5 inch in/out is noticeably quieter.

 

I'm running mid-length headers, stock cats, x-pipe, and the magnaflow that you are talking about with an internal x-pipe. It's not quiet. It was about the first 500-700 miles, could barely hear it, but it slowly gets louder. I love the sound of it, not as aggresive as the bullets I had on. It's got a deep, smooth tone to it. WOT it's loud. Normal driving it drones just like the bullets.

 

Is it the 5x11x22 or the 5x8x24 dual in/out?

also 2.5 or 3 inch set up?

 

Thanks, TBSS and hemiK. Both of your posts help. I dont want a real loud exhaust, but one that you can hear at WOT, plus maintain as much 'wide-open' performance using the appropriate muffler. I have long tube headers and high-flow cats, so I don't expect it to be real quiet, nor do I want it real quiet, just not real loud (except WOT). Sounds like this muffler will quiet it down a little, which is OK.

With the x-pipe in the muffler, how useful and effective is it there? With the optimum location of the X as close to the cats/headers as possibe, it would seem that putting an X firther back in the system would not be as effective. I suppose though, relatively speaking, putting back about 4 more feet (inside the muffler vs. where the pipes converge) is not that much difference.

OK, hemikiller, you have both an x-pipe and the tru-x muffler on yours which has an x in it, too. Have you tried any configurations with just one or the other, and if so, noticed any difference?

If the X in the muffler will provide the needed x-pipe transition, then it will be more cost effective to just use that instead of buying and putting in an external x-pipe.

Comments/other thoughts?

 

I already had the x-pipe on with the bullets. When I put the tru-x muffler on, I just left the x-pipe on. I didn't feel any power difference what so ever. I do plan on taking the regular x-pipe out and replacing the stock cats with the high-flow cats. BTW, I'm running 2 1/2" piping. If you've got anymore questions, I'd be glad to help!

 

well we started on the muffler set up today. ill see how loud the true duals are with the new bigger muffler.

 

it sounds mean