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Magnaflow muffler install on a 2015 5.0

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Old 12-31-2018, 11:04 AM
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I put a 12249 on with stock resonator in place this week. With 10sp 18 I get drone at 1500-1800....enough that I may go back to stock or try the 12279. Do you have any drone if you hold it at say 1700 rpm?
Old 12-31-2018, 11:09 AM
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Originally Posted by cwoodffr
I put a 12249 on with stock resonator in place this week. With 10sp 18 I get drone at 1500-1800....enough that I may go back to stock or try the 12279. Do you have any drone if you hold it at say 1700 rpm?
I don't know which one I have, it's a small ish Magnaflow muffler. 6 speed with 3.31 gears, no drone what so ever in 6th. But 5th on the highway is annoying. I have the stock resonator-back that I swap back and forth with the Magnaflow depending on how I feel. I have the stock muffler on more often than I do the Magnaflow.
Old 12-31-2018, 11:32 AM
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Originally Posted by cwoodffr
I put a 12249 on with stock resonator in place this week. With 10sp 18 I get drone at 1500-1800....enough that I may go back to stock or try the 12279. Do you have any drone if you hold it at say 1700 rpm?
The 12279 is 24" (actual muffler) and the 12249 is 18". The larger muffler completely eliminates drone. I cant even hear mine at cruise. Its just a tiny bit louder then stock at 2000 rpm. Go with the 12279
Old 12-31-2018, 11:56 AM
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The 24in magnaflow drones as well at least it did on mine.
Old 12-31-2018, 04:26 PM
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did you leave on the resonator? If so it does NOT drone one bit.
Old 12-31-2018, 05:25 PM
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Yea I left the resonator on and yes it droned at 75mph.
Old 12-31-2018, 06:00 PM
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To drone?..... or Not to drone?....that is the question

guess I should get off my *** and install this thing next year
Old 12-31-2018, 07:04 PM
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Originally Posted by 808XLT
To drone?..... or Not to drone?....that is the question

guess I should get off my *** and install this thing next year
Naaa.... just send it my way and I'll err dispose of it for ya
Old 02-23-2019, 11:19 PM
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Default welds , magnaflow install

local shop installed magnaflow today.

I supplied the muffler. They added the extra pipe. $200 job. It sounds nice , low quiet rumble at idle and cruisong then nice louder growl when you step on it


wondering why not cut the stock pipe to correct lenght to fit the magnaflow muffler? why weld in an extra pipe? more strength?

Last edited by 808XLT; 02-24-2019 at 12:53 AM.
Old 02-24-2019, 09:08 AM
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Ooooof to their welding job. They couldn't use their equipment and expand one pipe a little to match up and weld better? damn. That's junk looking work :/ I'd be ashamed to call that my product if I was a shop......


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