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Old 07-18-2012, 03:44 PM   #1
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Default Bros op on muff.

I'm finally getting around to upgrading the exhaust system on my nb and have some questions.

I am sticking with my 2.5in begi dp, but am having a friend at an exhaust shop build the rest of the system for me. The cat is going bye-bye as well as the resonator, and I am planning on getting rid of the lower half of the begi dp that contains the flexpipe and flange and running a slip fit all the way back to the muffler instead.

I want a quiet setup because with the 4.30 rear end I spend a lot of time above 4k rpm in cruise and I don't want to go deaf. Will I be happy with a
2.5in system back to a large magnaflow muffler or am I leaving power on the table without going 3in?

Turbo is a 2854 and I run 15psi.

Also, what is the largest magnaflow that will fit under my nb without modification?
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Old 07-18-2012, 03:46 PM   #2
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3" or you're leaving power on table.
5x11x22 iirc
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Old 07-18-2012, 03:54 PM   #3
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5x11x22 or die by fire.
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Old 07-18-2012, 04:18 PM   #4
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Should I go right from the 2.5in dp to 3in or what? Also who's got he cheapest price on magnaflows?
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Old 07-18-2012, 04:20 PM   #5
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yes. either have the cat step up to a 3" outlet, or make the exhaust bolt up to the 2.5" DP and step up to 3" the rest of the way.

performancepeddler.com will have the best prices if you email them for a better price (see site)

but all vendors will sell mangaflow mufflers are exactly the same price advertised.
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Old 07-18-2012, 04:45 PM   #6
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4" exhaust or bust
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Old 07-18-2012, 05:15 PM   #7
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4"? I may need you to fly to Detroit so I can take advantage of your skills with a sawzall.

Ok, so have him come off the dp with a short taper up to 3", back to a 5x11x22" magnaflow with a 3" opening, profit?

Ordering muffler tonight, what are you gays using for a tailpipe?

Thanks
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Old 07-18-2012, 06:23 PM   #8
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we use a pipe for a tail pipe
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Old 07-19-2012, 09:35 PM   #9
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Ok, I ordered the 5x11x22 magnaflow last night. Best deal I found was $101 shipped off amazon, it should be here early next week.
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Old 07-23-2012, 10:12 PM   #10
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My muffler came in the mail today. I ordered the magnaflow #12579 with 3" in/out (5x11x22). It's freakin huge!

I thought I was getting a straight through design but it actually forks off into two chambers and then back to one at the exit. I hope I got the right one?

My car is going under the knife Wednesday morning, I'll update when I get her home.
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Bros op on muff.-img_20120723_211446-large-.jpg   Bros op on muff.-img_20120723_212032-large-.jpg   Bros op on muff.-img_20120723_212047-large-.jpg  

Last edited by flounder; 07-23-2012 at 10:41 PM.
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Old 07-23-2012, 10:20 PM   #11
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Post pics. I don't think you got the right one. The right one is straight through
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Old 07-23-2012, 10:32 PM   #12
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Quote:
Originally Posted by flounder View Post
My muffler came in the mail today. I ordered the magnaflow #12579 with 3" in/out (5x11x22). It's freakin huge!

I thought I was getting a straight through design but it actually forks off into two chambers and the back to one at the exit. I hope I got the right one?

My car is going under the knife Wednesday morning, I'll update when I get her home.
What????

My magnaflow is straight all the way. I think you got the wrong one.
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Old 07-23-2012, 10:38 PM   #13
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What part number is yours?


1000th post!
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Old 07-23-2012, 11:12 PM   #14
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if its chambered, its weaksous and you should return it
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Old 07-23-2012, 11:19 PM   #15
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that's not right.

here's mine" straight through: [img]www.boostedmiata.com/gallery2/d/11084-2/parts+004.jpg[/img]

Last edited by curly; 07-24-2012 at 03:39 AM.
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Old 07-24-2012, 03:39 AM   #16
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ololoollololololloolololollo brainy can't post pics.

edit: ahahghehwhahwhas your ***** broken.
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Old 07-24-2012, 04:08 AM   #17
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Haa haa! <Nelson's voice>
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Old 07-24-2012, 04:14 AM   #18
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Huh, no boostedmiata.com stuff works for me, "Problem loading page".
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Old 07-24-2012, 04:53 AM   #19
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pretty sure it's 12578. lol. missed it by a digit sucka!

http://www.magnaflow.com/02product/d...rtnumber=12578
http://www.magnaflow.com/02product/d...rtnumber=12579

note the core size. the 12579 has a "dual 2.5"
12578 is 3". you're welcome!
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Old 07-24-2012, 09:50 AM   #20
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Quote:
Originally Posted by curly View Post
ololoollololololloolololollo brainy can't post pics.

edit: ahahghehwhahwhas your ***** broken.

was on the mobile site, didn't parse my img tags... weird.
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