Performance Muffler Question

[jough]

Performance Muffler Question-updated

Everyone seems to recommend the Magnaflow 12589.
However, it is center in (3") and ONE offset out (3").

My factory muffler is 2.75" center in and TWO 3" outlets.
A local muffler shop said that one of the two outlet pipes is a dummy.

That would make sense for using the Magnaflow 12589.
Is the outlet closest to the driveshaft a dummy?

I am looking to replace my factory muffler with a better flowing one.

EDIT 1: Ok, I think I figured it out. Most go with 12589 and just do away with the roughly 10" dual pipe.
I think I might go with the Jones MF2590 which does have the two 3" outlets. It is comparable to the Magnaflow 12590, but is half the price and flows better.

EDIT 2: See top of page 3 for post install review.

 

[ccapehartusarmyINF.(ret)]

dude i went with the blowmaster super 10 it was cheap got mine off amazon for like 70 bucks
they claim its a muffler but its more like a metal box that covers a little bit of your exhaust lol

 

[Walkercraig01]

I thinks quiet tho but yea it's highly regarded here

 

[Mudfrog]

It's not quiet. It's just not as loud as a 2 Chamber style muffler. It will be somewhere in
between a 50 and 70 series in terms of loudness.

 

[mmeachem]

Everyone seems to recommend the Magnaflow 12589.
However, it is center in (3") and ONE offset out (3").

My factory muffler is 2.75" center in and TWO 3" outlets.
A local muffler shop said that one of the two outlet pipes is a dummy.

That would make sense for using the Magnaflow 12589.
Is the outlet closest to the driveshaft a dummy?

I am looking to replace my factory muffler with a better flowing one.

EDIT: Ok, I think I figured it out. Most go with 12589 and just do away with the roughly 10" dual pipe.
I think I might go with the Jones MF2590 which does have the two 3" outlets. It is comparable to the Magnaflow 12590, but is half the price and flows better.

The 12589 is tame but nice when you step on it.


Sent from my iPhone using Tapatalk

 

[jough]

From my research, it looks like I have about a 50-50 chance of drone around 70mph (2000 rpm), even with the 5x11x22" muffler and keeping both outlets. I guess that I'll find out soon.

 

[Mudfrog]

You will still have some drone even with the 5x11x22. It's much less than the other performance mufflers though.

 

[JennaBear]

Don't swap out a muffler for performance gains....there really isn't much.

 

[ezdaar]

notice the year,

He could gain a good seat of teh pants increase with a good catback.

 

[JennaBear]

EH, I didn't see much from either the Magnaflow catback nor the Corsa Touring on my 2004 Z71.

 

[ezdaar]

meh, me and all of my friends on all of our 99-06 GM vehicles notice decent gains.

 

[JennaBear]

Cam, LTs and blower definitely made up for the lack in performance increase of the exhaust ;-)

I guess all I am saying, is I wouldn't drop a ton of coin on an exhaust swap just for performance gains. It would be more of a benefit appearance and acoustic wise.

 

[ezdaar]

Fo sho!

Much jelly!

 

[JennaBear]

Honestly, that year sees good performance gains just from a Y pipe swap. That is where the issue is on those exhausts.

 

[ezdaar]

definatly. the bends and merge are complete kaka.

I just prefer to do it all at once, header to tips. 3" stainless. buy once, cry once. ya know

 

[JennaBear]

Agreed. But if you are saving pennies, that would be where I would avoid the costs.

 

[jough]

With my swapped in LQ9, I had to re-use the 5.3 factory y-pipe & exhaust. So...I know that my whole exhaust system is currently the weak point. I am going with just the muffler for now. Longer term, I'm looking for a used 6.0 two piece y-pipe and factory Denali or Escalade mufflers & pipe.

The Jones MF2590 was $63 shipped from Amazon and one of the better local shops quoted me $60 to weld it in. This will do until I find a reasonably priced 6.0 two piece y-pipe.

My goal for this build is to have a sleeper...a Dr. Jeckyl & Mr. Hyde. If I want to take guests to dinner in it, they would never know of the performance...until that squirt in the Range Rover thinks he can pass. This is also low budget build (for a change).

 

[ezdaar]

Jough check this out. You might want to wait a month or two for it to be released.

http://www.performancetrucks.net/fo...gineering-true-dual-exhaust-prototype-538474/

Page 4, for installed pics.

 

[jough]

Those are stunningly beautiful. I'd have to carry a creeper around just to show people those pipes.

 

[ezdaar]

It's a "header" back kit. So be prepared! Lol! Less than 800 gets you a full on stainless header to tip kit!

I can't wait! Going to sell my current speed eng 1 3/4" stainless headers for their 1 7/8" and the exhaust kit.

Oooo yeaaaaa!