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Which would be louder, GMMG or Thrush Rattler?

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Old Aug 10, 2017 | 05:20 PM
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Car: 1989 Formula WS6
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Which would be louder, GMMG or Thrush Rattler?

Wanting a loud, mean-sounding true dual setup
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Old Aug 10, 2017 | 09:19 PM
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Re: Which would be louder, GMMG or Thrush Rattler?

Interesting question. Will be interested to read what people think.

My guess..and it's nothing but that...the GMMG.
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Old Aug 10, 2017 | 11:18 PM
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Re: Which would be louder, GMMG or Thrush Rattler?

GMMG is not a true dual exhaust. I have the GMMG. It's loud but not annoying loud unless I am hitting it hard and I don't care at that point. Too loud of exhaust only pisses the neighbours off (so I only idle through my area) and is pretty much pointless. I do live in the city and like my neighbours.
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Old Aug 10, 2017 | 11:45 PM
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From: Tulsa, OK
Car: 1989 Formula WS6
Engine: L03 305 TBI
Transmission: T-5
Axle/Gears: 10 Bolt; 3.42 Posi
Re: Which would be louder, GMMG or Thrush Rattler?

Originally Posted by Chopski
GMMG is not a true dual exhaust. I have the GMMG. It's loud but not annoying loud unless I am hitting it hard and I don't care at that point. Too loud of exhaust only pisses the neighbours off (so I only idle through my area) and is pretty much pointless. I do live in the city and like my neighbours.
I understand it's not a true dual exhaust. I should have been clearer.

The GMMG uses two chambered mufflers. The only thing that keeps it from being a true dual exhaust is the mid-pipe.

Many of the true dual exhaust setups on 3rd gens run two pipes in place of that single mid-pipe. That is what I want to do.

Madhammer sells those chambered mufflers separately. http://www.madhammer2.com/_p/prd12/1...t-muffler-tube

I want my exhaust LOUD!

Regardless of whether the GMMG mufflers or the Thrush Rattlers are louder, if there's something else that is even louder, I want to look into it. I'm running a low compression 305 and dual cats, so I'm not that worried about being TOO loud.

Last edited by seanof30306; Aug 11, 2017 at 12:56 AM.
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Old Aug 11, 2017 | 12:45 AM
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Re: Which would be louder, GMMG or Thrush Rattler?

Instead of unadulterated loud, you should be hunting for a nice tone and then increase the volume.
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Old Aug 11, 2017 | 12:53 AM
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Engine: L03 305 TBI
Transmission: T-5
Axle/Gears: 10 Bolt; 3.42 Posi
Re: Which would be louder, GMMG or Thrush Rattler?

Originally Posted by blacksunshine'91
Instead of unadulterated loud, you should be hunting for a nice tone and then increase the volume.
I want the opposite of what modern exhaust systems offer.

I'm not interested in an exhaust that's quiet under normal conditions and LOUD only when you romp on it. I'm not interested in an exhaust system that doesn't drone when you're cruising down the road.

I haven't turned my stereo on in years. The car is my music.

I want little old ladies and nuns to flip me off when I drive by.

I want dogs to howl and cats to bow up.

I want car alarms to go off when I pass.

I want to have to yell to my passenger so she can hear me.

I want it to sound like the Impala on Supernatural, but louder.

Here is what I want:
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Old Aug 11, 2017 | 01:24 AM
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Re: Which would be louder, GMMG or Thrush Rattler?

Forget about the duals, it is just a hassle.

If you want loud then you want a large 4 inch exhaust. Get rid of the cats, they are a better muffler than the muffler. The shorter the muffler the louder it is going to be. Headers help make it louder and bring through more of the lope of the cam (which in your case there probably is none)

Last edited by QwkTrip; Aug 11, 2017 at 01:29 AM.
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Old Aug 11, 2017 | 01:40 AM
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From: Tulsa, OK
Car: 1989 Formula WS6
Engine: L03 305 TBI
Transmission: T-5
Axle/Gears: 10 Bolt; 3.42 Posi
Re: Which would be louder, GMMG or Thrush Rattler?

Originally Posted by QwkTrip
If you want loud then you want a large 4 inch exhaust. Get rid of the cats, they are a better muffler than the muffler. The shorter the muffler the louder it is going to be. Headers help make it louder and bring through more of the rumble of the engine.
I have headers.

Not interested in a huge single exhaust.

Keeping the cats. I believe in them. Also, I think the muffling effect of the cats is what lets me get more extreme on the mufflers. I want it to be loud, but I'm not wanting to have a line of cops following me around.
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Old Aug 11, 2017 | 01:43 AM
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Re: Which would be louder, GMMG or Thrush Rattler?

LOL! Changing your tune I see.
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Old Aug 11, 2017 | 02:02 AM
  #10  
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From: Tulsa, OK
Car: 1989 Formula WS6
Engine: L03 305 TBI
Transmission: T-5
Axle/Gears: 10 Bolt; 3.42 Posi
Re: Which would be louder, GMMG or Thrush Rattler?

Originally Posted by QwkTrip
LOL! Changing your tune I see.
ummmm .... nowhere in that video did I see Stacey David getting cuffed and stuffed
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Old Aug 21, 2017 | 09:13 PM
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Car: 85 Z28
Engine: GMPP 350 HSR
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Axle/Gears: 4th gen 3.42 Posi LS1
Re: Which would be louder, GMMG or Thrush Rattler?

I have LT headers no cats single 3" with a pypes M-80 race pro muffler and I set off car alarms as I cruise by!! I love it. Deep but not loud at idle and screams when your in it.. I have a few youtube vids posted of it if you search.
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Old Aug 23, 2017 | 01:15 PM
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Re: Which would be louder, GMMG or Thrush Rattler?

If you want loud like a Cherry Bomb, why not use Cherry Bomb's? Two 8" Cherry Bomb's will be basically as loud as straight piped.

It will also sound like garbage.
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