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Magnafliw 12909 on 6.2

michigan2500hd

By michigan2500hd
in Modifications & Accessories

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Iceman22 Enthusiast

Iceman22

Posted
Posted

Question to the guys with the 12909 already installed.... it looks like the only way to purchase it is center in and offset out.

 

After getting under my truck it looks like the stock muffler is offset in and center out. Am I missing something?

 

 

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michigan2500hd Senior Enthusiast

michigan2500hd

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The 12909 is off set on one end and center on the other. The muffler ends up being angled a little to work out from the pics on here.

 

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Lgetz Senior Enthusiast

Lgetz

Posted
Posted

Question to the guys with the 12909 already installed.... it looks like the only way to purchase it is center in and offset out.

 

After getting under my truck it looks like the stock muffler is offset in and center out. Am I missing something?

 

 

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Muffler is fully reversible so works just fine.

Iceman22 Enthusiast

Iceman22

Posted
Posted

Muffler is fully reversible so works just fine.

Ah!!!! Okay, this makes way more sense now for the guys saying it was a straightforward install. You run a muffler backwards on Subaru Sti and your back pressure would be all jacked up. Didn't realize the 12909 is straight through design and not chambered

 

 

What are you guys paying for the muffler itself? Anyone find it for a better price than $125 shipped through amazon?

 

Don't want to get bent over on parts since I'm clearly going to on labor. Can't find a shop within 100 miles willing to do the install for less than $100. Just find it funny I could install a cat back myself but can't install a muffler. I need to learn to weld lol

 

 

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Lgetz Senior Enthusiast

Lgetz

Posted
Posted

Ah!!!! Okay, this makes way more sense now for the guys saying it was a straightforward install. You run a muffler backwards on Subaru Sti and your back pressure would be all jacked up. Didn't realize the 12909 is straight through design and not chambered

 

 

What are you guys paying for the muffler itself? Anyone find it for a better price than $125 shipped through amazon?

 

Don't want to get bent over on parts since I'm clearly going to on labor. Can't find a shop within 100 miles willing to do the install for less than $100. Just find it funny I could install a cat back myself but can't install a muffler. I need to learn to weld lol

 

 

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Was able to get muffler for a bit less with a 20% Advance Auto coupon. Cost to cut off OE muffler and flapper valve and replace with Magnaflow was $40.

GMC_SD_Ult_16 Enthusiast

GMC_SD_Ult_16

Posted
Posted

12909 here... Removed OEM muffler flapper and resonator. Sound in v4 is minimal any sound like light radio in cab and you would never know it was changed... Once rpms get over 2,000 start to hear slight low rumble and at WOT sounds like a 6.2L should sound. It reminds me of my 08 SD sound that came stock. 3.5 inch in and 3.5 inch all the way out to my dual tips. Also added an AFE momentum GT CAI and have improved mpg and sound. Happy with this setup. $100 to install.

 

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michigan2500hd Senior Enthusiast

michigan2500hd

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I had my Magnaflow 12909 installed this morning. Found a shop to do it for $60 including a 3.5" to 3" adaptor needed to retain the flapper valve. It sounded good when the guy backed it out and drove it to the front of the shop.

However my first impressions are that it's really quiet in the cab. I compare it to my 2011 6.2 that I think had the best sounding stock exhaust I've ever heard on a truck. If course I improved that by swapping to a Flowmaster muffler and never looked back. However these k2's have a much quieter interior and I can hardly tell there's a different muffler on there.

It must sound better and louder from the outside because I've got a couple looks from people on the street. I have zero drone and zero AFM sound.. At least it isn't louder then stock since I could hear a slight sound difference when it was stock.

All in all if you want a tad deeper and tougher sound then this way is a winner. I just wish it was louder when I hit the gas hard. I'll be towing later today so we'll see how that sounds.

 

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michigan2500hd Senior Enthusiast

michigan2500hd

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Update..At lunch I used a hitch Receiver pin to hold open the flapper valve. Its amazing the sound difference from just doing that it's much louder at take off, a little louder at idle but I haven't noticed any v4 chopper noise yet from it I guess we'll see how this goes. Dang this muffler has a deep tone!!

 

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Iceman22 Enthusiast

Iceman22

Posted
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Thanks for the update! Definitely going to delete the flapper now. And I feel a little better about the $100 install quote now that I know I'm not the only one paying that much.

 

Closet place willing to do it for less than $100 is a place 2.5hrs away that'll do it for $60. Add in gas and it makes no sense to drive that far out of the way

 

 

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  • 1 month later...
Iceman22 Enthusiast

Iceman22

Posted
Posted

Bump. From the dead....

 

 

Just had my 12909 installed. Deleted the valve but retained the resonator. My initial thoughts are it’s quieter than expected. I set out to find a system that wasn’t too obnoxious so i went into it knowing it wasn’t going to be like a Borla Atak but I guess I was hoping it would be slightly louder; especially at WOT. Can anyone comment if the exhaust gets a little louder with some miles on it? Or what I’m getting day 1 will be the same tone a year from now?

 

I just read so many reviews of guys saying it was slightly more aggressive at idle/cruising speeds and really wakes up at WOT. Guess I’m just confused

michigan2500hd Senior Enthusiast

michigan2500hd

Posted
  • Author
Posted
Bump. From the dead....

 

 

Just had my 12909 installed. Deleted the valve but retained the resonator. My initial thoughts are it’s quieter than expected. I set out to find a system that wasn’t too obnoxious so i went into it knowing it wasn’t going to be like a Borla Atak but I guess I was hoping it would be slightly louder; especially at WOT. Can anyone comment if the exhaust gets a little louder with some miles on it? Or what I’m getting day 1 will be the same tone a year from now?

 

I just read so many reviews of guys saying it was slightly more aggressive at idle/cruising speeds and really wakes up at WOT. Guess I’m just confused

The only time I can really tell the Magnaflow is on there is when I remote start it. That or when I pin the flapper valve open. I've considered deleting the resonator but no one around here can deal with 3.5" pipe.

I expected it to sound like my 2011 6.2 with the Flowmaster. Not even close lol. I probably have 1000 miles on my Magnaflow and no change in sound. With the flapper open it sounds deep but after getting used to it I think I want something a little louder.

Ok the plus side I don't have any drone.

 

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Iceman22 Enthusiast

Iceman22

Posted
Posted
The only time I can really tell the Magnaflow is on there is when I remote start it. That or when I pin the flapper valve open. I've considered deleting the resonator but no one around here can deal with 3.5" pipe. I expected it to sound like my 2011 6.2 with the Flowmaster. Not even close lol. I probably have 1000 miles on my Magnaflow and no change in sound. With the flapper open it sounds deep but after getting used to it I think I want something a little louder.

Ok the plus side I don't have any drone.

 

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I don’t know if this makes me feel better or worse lol. I have my flapper completely deleted.... my next thought was cutting the resonator off and just running a small turn down at that location.

 

The exhaust shop that did the install said the resonator cuts sound by 10%. I wonder if that’s a generic phrase or if that’s accurate... if it’s accurate 10% louder than it currently is wont be much of a difference at all!

 

 

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  • 1 month later...
hotrod80z Enthusiast

hotrod80z

Posted
Posted

I just had my 12909 installed.  I wanted a step over stock, still fairly quiet inside, and only a slight rumble that doesn't wake my neighbors when I hit my remote start.  That is exactly what got!  I left the flapper and resonator in place, the shop wasn't a muffler shop, just a regular garage, but they were easily able to fab a 3.5-3" adapter for the flapper. Charged me $85 cash. I am extremely happy with the sound, though first impressions were actually quieter inside than I imagined.  This time of year doesn't lend itself well for window down impressions in Canada, and the roads are too slippery for any balls out blasts, but I can definitely tell its there when I roll on a bit.  I will wait for the weather to warm up, and I will try pinning the flapper open for comparisons, but extremely happy with the sound

KARNUT Senior Enthusiast

KARNUT

Posted
Posted

GM went through a lot of trouble to insulate the cab from outside noise. At the same time getting good flow through the exhaust with out a lot of exhaust sound. That the reason they’re so many cats and mufflers. It’ll take some chopping to here it loud inside. I’m glad all the came about at the time I’m happy with quiet at 60.


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