To J, or not to J - Pontiac G8 Forum: G8 Forums -
Exhaust Tech Headers, Catbacks, Mufflers, lack of mufflers

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post #1 of 7 (permalink) Old 04-02-2017, 01:29 PM Thread Starter
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To J, or not to J

I have completed a DOD or AFM delete, level 1 cam, Kooks headers and X pipe. Now I need to figure out the axle back. As I read up, I'm thinking the Solo axle back is not much more than a J pipe (no muffler). Since I have done the DOD delete I'm thinking I won't have the drone problem, and therefore won't need the benefit of the J pipe. Correct?

If so, what muffler options are left? GXP, Magnaflow and ? Whatever I get has to bolt on behind the axle. So I'm thinking I can't easily use Borla or Corsa, as I don't see bolt on options.

Thoughts and recommendations welcome.
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post #2 of 7 (permalink) Old 04-02-2017, 01:54 PM
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The "J" is tuned to mellow the tone when in 8 cyl mode. It really doesn't do much in 4 cyl mode based on my experience.


2009.5 Liquid Red with Sport and Premium. Rotofab, cortex 91, Solo AB, 63K miles
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post #3 of 7 (permalink) Old 04-02-2017, 02:59 PM
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J pipes have no effect on the AFM changeover drone. Only the 1800 rpm drone.
Many folks love the GXP mufflers with headers. I lent mine to a forum member and he liked it so much he bought a set. Worth a try!

2009 G8 GXP, #715 0f 1829 (#18 of 23 as optioned), MSM, 6M, Sunroof, Onyx/Red

2009 G8 GXP, #807 of 1829 (#37 of 68 as optioned), MSM, 6A, Sunroof, Onyx

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post #4 of 7 (permalink) Old 04-02-2017, 03:11 PM
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GXP mufflers FTW. Check out Ebay.
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post #5 of 7 (permalink) Old 04-06-2017, 09:56 AM
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^^ this
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post #6 of 7 (permalink) Old 04-07-2017, 08:38 AM
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Glad to see this thread. I have a full OBX system waiting to be installed and picked up some GXP axlebacks just for it, replacing the Solo axlebacks.
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post #7 of 7 (permalink) Old 04-07-2017, 12:29 PM Thread Starter
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Magna - Drone

The DOD delete is done. Kooks headers and x-pipe installed. New cam. Getting tuned today. I put my old axle back Magnaflow mufflers back on and I still have the loud drone at 1,800 to 2,000 rpm. I'd love to put on Borla or Corsa but they don't offer an axle back option. Maybe I have to go with the Solo J pipe to be sure the drone is gone. I hear GXP a lot, but gotta think that option is going to restrict flow and steal some HP.
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