Magnaflow 12468 - Pontiac G8 Forum: G8 Forums - G8Board.com
Exhaust Tech Headers, Catbacks, Mufflers, lack of mufflers

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post #1 of 33 (permalink) Old 10-11-2016, 02:11 PM Thread Starter
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Magnaflow 12468

Sorry if this has been already been answered, but i could not find a clear answer. So I ordered Magnaflow axle back 16883 as i did not want it to be to load, just a nice deep rumble, just wanted it to sound like a V8. I have read about the drone and that a Magnaflow 12468 will stop the drone. Will this work?
Also will turning off the AFM with a tuner stop the drone with out any other changes??

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post #2 of 33 (permalink) Old 10-11-2016, 03:07 PM
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mine took away drone and then some. I'm actually having mine pulled tomorrow. I would assume in your case that the magnaflow axle backs alone with an x pipe would be sufficient.


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post #3 of 33 (permalink) Old 10-11-2016, 05:50 PM Thread Starter
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Do you mean disabling the AFM took the drone away? Or installing the Magnaflow 12468 took the drone away?

09, G8 GT
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VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.
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post #4 of 33 (permalink) Old 10-12-2016, 02:13 AM
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I have the 12468 installed along with Lt headers and a Magnaflow exhaust, my DOD is disabled. The 12468 does a great job at toning the exhaust. But it does not eliminate drone fully only muffles it. You will not have drone inside the cabin as before but it's still loud between 1500/2000 rpm.

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post #5 of 33 (permalink) Old 10-12-2016, 10:12 AM Thread Starter
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So i'm wondering if the Magnaflow 12468 is what i should install.
- If I understand what bad-s said it took all the drone away.
- BarnesGN said it helps, but still loud at 1500/2000 RPM, and only muffed it?
Is there a better choice??

09, G8 GT
Premium and Sport Pkgs

VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.

Last edited by dave2009; 10-12-2016 at 10:35 AM.
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post #6 of 33 (permalink) Old 10-12-2016, 11:15 AM
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There is a cheaper brand i believe its called magna air and it does not have the drone. That's what i put on my car. It sounds fine to me. It's definitely not loud but not quiet either. When you get into it you know it's there.
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post #7 of 33 (permalink) Old 10-12-2016, 11:31 AM Thread Starter
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The Magna Air, is for the X pipe only. I already have Magnaflow axle backs.
I want the best sound more than saving money, so will it work as good as Magnafow 12468?

09, G8 GT
Premium and Sport Pkgs

VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.
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post #8 of 33 (permalink) Old 10-12-2016, 12:13 PM
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Oh boy. I wasn't informed of that. I don't have the x pipe installed on my car. Mine sound nice and deep and not raspy or put put put sound like a flowmaster. Now i'm panicking!! lol. Also the Magna Air are stainless as well. The guy told me its basically the same muffler and the magnaflow just cheaper. I can try and post a audio clip on youtube perhaps to give you an idea.
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post #9 of 33 (permalink) Old 10-12-2016, 02:15 PM
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Magnaflow 12468

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Originally Posted by dave2009 View Post
So i'm wondering if the Magnaflow 12468 is what i should install.
- If I understand what bad-s said it took all the drone away.
- BarnesGN said it helps, but still loud at 1500/2000 RPM, and only muffed it?
Is there a better choice??


Yea. The 12468 with headers and pypes violators had no drone but was way to quiet, I did not like it. With out the 12468 it was gnarly but obnoxious with god awful drone.


I just picked my car back up from having the 12468 removed. Now I have catless headers to x pipe to Gxp axle backs. So
Far so good. Quiet in the cab but has a good sound out side of the car. No drone with the little bit that I drove it.

The 12468 really quiets things down. I don't think I'd double it up with any mufflers if I were to run it again. I'd just do a straight pipe type axle back like SLPs or solos.


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post #10 of 33 (permalink) Old 10-12-2016, 02:59 PM
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I have a MagnaFlow 12468 that I also took off because it was too quiet for me with LT headers. I'm running a straight pipe setup that is loud with a bit of drone and I'm sure putting the MagnaFlow back on would fix that.

It's has a nice refined sound when paired up with some good axlebacks but I just wanted it louder.

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post #11 of 33 (permalink) Old 10-12-2016, 03:42 PM Thread Starter
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So if i have Magnaflow axle backs 16883 and Magnaflow 12468 i should have a low deep rumble, but not real loud, and no drone???
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post #12 of 33 (permalink) Old 10-12-2016, 03:51 PM
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No drone for sure in my experience. But it will be very quiet.


09 G8 GT - LT's, catless, x-pipe, GXP axlebacks, Tune, Intake, Polished Camaros, 245/285, H&R, Brembo
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post #13 of 33 (permalink) Old 10-12-2016, 04:13 PM Thread Starter
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It would still be louder than the stock mufflers and have some low rumble to it wouldn't it???

09, G8 GT
Premium and Sport Pkgs

VCM cai, BMR front & rear swaybars, front BMR swaybar end links. Kooks 1 7/8" long tube headers & Kooks 3" catted X-pipes, with Magnaflow Axle Backs 16883. 160 degree thermostat. NGK TR6IX spark plugs. Full Dyno Tune 372 rwhp. SuperPro SPF-TRC2000 motor mounts. PowerBond Race Performance Harmonic Balancer. Holden V8/6.0 quarter panel badge, Pontiac front & rear arrows with Holden lion insert (black & chrome), drilled/slotted rotors.
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post #14 of 33 (permalink) Old 10-12-2016, 04:46 PM
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I'm sure it would be louder than stock with a bit of a rumble. But it would probably be very quiet by most comparisons.

2009.5 SBM GT: Lots of show with some go.
The garage queen.

2008 IOM GT: Some go, working on the show.
The daily driver.

2004 Blazer Xtreme: Lots of go.
Sold and will be missed.
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post #15 of 33 (permalink) Old 10-12-2016, 05:33 PM
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Do you still have the factory mid muffler and resonators in I'm assuming?


09 G8 GT - LT's, catless, x-pipe, GXP axlebacks, Tune, Intake, Polished Camaros, 245/285, H&R, Brembo
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post #16 of 33 (permalink) Old 10-12-2016, 05:59 PM Thread Starter
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Yes the only change is the Axel Backs.
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post #17 of 33 (permalink) Old 10-12-2016, 06:02 PM
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Shouldn't be any issue. I bet you'll have zero drone at all


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post #18 of 33 (permalink) Old 10-12-2016, 06:08 PM Thread Starter
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You mean just by adding the Magnaflow 12468 in place of the mid muffler?
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post #19 of 33 (permalink) Old 10-12-2016, 06:09 PM
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By not doing anything. Just bolting on the axle backs with stock stuff


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post #20 of 33 (permalink) Old 10-12-2016, 06:15 PM Thread Starter
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Ok sounds great, I will be installing them this weekend. I kept reading about the drone, so I wanted to be ready to install the 12460 right away. Thanks for all the help!!

Last edited by dave2009; 10-13-2016 at 10:46 AM.
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