Magnaflow Mid-Muffler Quieter Than Stock? - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 3 (permalink) Old 03-04-2018, 10:38 AM Thread Starter
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Mr Nick's Avatar
 
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Location: Joliet, IL
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Magnaflow Mid-Muffler Quieter Than Stock?

Currently have SOLO HFC's, stock mid section, and Dynomax Super Turbo muffers in custom made axle backs. Engine has a Stage 1 DOD delete cam.

It's just a touch too loud for my tastes as a daily driver, and has a very slight drone at low RPM cruising. When I had factory cats & mid section, and just SOLO J-pipe axle backs, the volume was just right.

I'm wondering if replacing the factory mid muffler with the dual in/out Magnaflow will quiet it down a bit?

Open to other suggestions as well.

2017 300S HEMI
2009 G8 GT sold
1969 Olds Cutlass
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post #2 of 3 (permalink) Old 03-05-2018, 06:09 AM
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Originally Posted by Mr Nick View Post
Currently have SOLO HFC's, stock mid section, and Dynomax Super Turbo muffers in custom made axle backs. Engine has a Stage 1 DOD delete cam.

It's just a touch too loud for my tastes as a daily driver, and has a very slight drone at low RPM cruising. When I had factory cats & mid section, and just SOLO J-pipe axle backs, the volume was just right.

I'm wondering if replacing the factory mid muffler with the dual in/out Magnaflow will quiet it down a bit?

Open to other suggestions as well.
That's strange. I have Pypes headers, no cats, Borla x-midpipe and the same mufflers and I feel like its really quiet. Drone is subjective but I feel like I'm really sensitive to it. I have more of a "humm" around 50 but nothing like when I switch to my custom j-pipe axlebacks. I have a separate Borla midpipe with a magnaflow muffler welded in but haven't tried it with the new mufflers to see what it sounds like. Here is video of mine. Note that a bit of the volume is because I'm backed up to my carport.

2009 LR GT,Red/Onyx, Sport, Roof
Vararam, pypes headers, Borla X pipe, 2014 SS mufflers, Pat G custom cam, 3.45 Camaro diff, Powerhaus/ Sky tune
Koni yellows, H&R springs (cut dead coil), Polyelast strut bushings, BMR Toe Rods and Trailing arms, Whiteline radius rod, front lower control arm and rear cradle bushings, GXP Front Bumper and Diffuser,
Axis 18's, 255/40 (front), 275/40 (rear) Firestone Indy 500 Tires

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post #3 of 3 (permalink) Old 03-05-2018, 09:15 AM Thread Starter
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Location: Joliet, IL
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I think people have different opinions of drone/hum/volume is. I don't mind the volume of the G8 while cruising, but it does still have an annoying tone which I consider to be drone. Sounds nice at idle and accelerating.

My Cutlass has a build small block, headers and Hooker AeroChamber mufflers. It's loud at idle & WOT, and rather mellow rolling down the highway at 2,500RPM. While it's louder than the G8 on the highway, the tone of the sound is not at all objectionable.

Like you said, it's very subjective.

I just want to quiet down the idle a hair and get rid of the little bit of highway drone it has.

UPDATE: Swapped the Super Turbo axle back for stock GT axle back. Now it's so quiet I hear the intake more than the exhaust. Nice and quiet rolling down the highway though.

May just pull the factory mid muffler and install a small Magnaflow dual/dual muffler and just an X-pipe and call it done.

2017 300S HEMI
2009 G8 GT sold
1969 Olds Cutlass

Last edited by Mr Nick; 04-01-2018 at 11:37 AM.
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