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.