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GMMG vs. True duals

This is a discussion on GMMG vs. True duals within the External Engine forums, part of the LSx Technical Help Section category; My car is bone stock right now. I really wanted to do true duals on my car. I wanted LT, ...

  1. #1
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    GMMG vs. True duals

    My car is bone stock right now. I really wanted to do true duals on my car. I wanted LT, no cats, h-pipe, flowmaster 1-chambers all the way out the back. However, it has been rather difficult finding an exhaust shop close to me that will do true duals. So as an alternative I was thinking of the Gmmg. Compared to the true dual system; I wanted to know how much louder would the duals actually be over the catback. I realize performance will be better with the duals but, I want to know if there is a big difference in decibal level and tone between the two.

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    Veteran 0rion's Avatar
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    There was a local cammed car running a GMMG with LT's and no cats. At WOT it made grown men wet their pants. If I ever replace my current catback with something other than duals it'll definitely be a GMMG.

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    Next Race= WSIR 2/26-27 SIK02SS's Avatar
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    GMMG sounds awesome on stock manifolds. with LTs its a quiet rumble at idle, quiet with normal driving, and screams at WOT. TDs are loud at idle, loud at normal driving, and screams louder at WOT (think racecar loud..at least mine is)

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    Member Blue_98_ws6's Avatar
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    wait i know this is pry a dumb question but whats a gmmg
    Built A4 with B&M Transpak shift kit, Hooker Lt's, 0RY, 4in cutout, Debaffled, K&N, SLP Lid, Bellows, p+p+descreened MAF,TB bypass, 180 degree Theromostat, AC removed, RP Trans fluid, oil, MSD 8.5 wires, Autolite Xtreme perf plugs, Nitto DR

    Coming soon SFC, 373 gears, 96mm intake/96mm TB, Tune

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    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by Blue_98_ws6 View Post
    wait i know this is pry a dumb question but whats a gmmg
    just a brand of catback exhaust. they use bullet style mufflers. great quality and sound.

  6. #6
    Member Blue_98_ws6's Avatar
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    never heard of them i was gonna go with flowmaster but i just found another thread about true duals thats like 5 pages long and i think im gonna do that now it definitely seems better

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    Member jd2002ss's Avatar
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    My car has GMMG w/ cats, Kooks headers and Y pipe. Comp 228/230 112 cam. It dyno'd at 405hp after tuning. The sound at idle is as sweet as it gets. At mild acceleration they know your coming, at WOT they run for cover!!! Highway speeds in 6th gear is very tolarable, I'm happy with my choice.

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    old timer blue02Z's Avatar
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    can we get some sound clips please? i like gmmg and would like to hear it on your ride

  9. #9
    Visualize°Design°Create SSwt00SS's Avatar
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    Quote Originally Posted by blue02Z View Post
    can we get some sound clips please? i like gmmg and would like to hear it on your ride
    www.ls1sounds.com

  10. #10
    Member nomorefords's Avatar
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    i have true duals w/gmmg muffs they aren't loud at idle but give a great sound under load and at WOT they're beautiful! Mandrel bend out through the back! I love them, they're low so if you're going with suspension NO lower then a pro-kit, but well worth the time and $$$ for GMMG!!!!

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