Muffler's for a nice rumble? - Pontiac GTO Forum
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post #1 of 22 (permalink) Old 12-24-2012, 09:31 PM Thread Starter
 
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Muffler's for a nice rumble?

My 68 Lemans has a 350 in it. I really don't want to deal with the headache's of headers. I was wondering if there is a clear favorite out there for mufflers that give the car a nice sounding rumble? The car basically has new exhaust on it from the engine all the way back, but I'm not real impressed with the sound of the exhaust. Any suggestions?
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post #2 of 22 (permalink) Old 12-25-2012, 10:36 AM
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I would say the ever popular Flowmasters (three chamber) or I have the Hooker Aerochamber mufflers on mine. Reasonably priced and very well constructed.

Or if you want it LOUD put on some Purple Hornies.



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post #3 of 22 (permalink) Old 12-25-2012, 10:50 AM
 
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Cherry Bombs- disturbing the peace since 1968
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post #4 of 22 (permalink) Old 12-25-2012, 11:05 AM
 
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I second the Flowmasters three chamber vote.
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post #5 of 22 (permalink) Old 12-25-2012, 04:02 PM
 
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Here's a different point of view...
I am not a fan of the Flowmaster sound; I prefer the sound (and flow rates) of either the Goerlich XLerator or DynoMax Welded Ultra-Flo.

They are not as brash as the Flowmaaster.

1968 Pontiac GTO
1983 Pontiac Bonneville (G) wagon
2008 Pontiac G8 base
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post #6 of 22 (permalink) Old 12-25-2012, 04:48 PM
 
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Originally Posted by kilkm68 View Post
Cherry Bombs- disturbing the peace since 1968

the shorter the louder

2006 QSM/RED/M6/18"David
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post #7 of 22 (permalink) Old 12-26-2012, 02:36 PM
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A lot of the sound is dependent on the characteristics of the engine and the rest of the exhaust system.

I'm running headers, Pypes 2 1/2" exhaust, X-pipe, and Pypes Race-Pro mufflers. Here's a couple of links where you can hear what it sounds like.
(skip forward to about 1:36)

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post #8 of 22 (permalink) Old 12-26-2012, 04:43 PM
 
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I would like to know how a GTO sounds with magnaflow mufflers.. here is a short clip of mine with the Flowmasters.. (I found a test online where they checked how loud some mufflers are and for performance.. no signs that flowmasters flow worse than most others! If I find it again I will post it)

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post #9 of 22 (permalink) Old 12-28-2012, 11:30 AM
 
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The 2 1/2" system on my '67 was bent to original specs, but with an "H" pipe and the shorter body DynoMax SuperTurbo's - I also have HO manifolds. After a lot of looking, I found some data that indicated the DynoMax SuperTurbos can provide zero flow restriction up to abot 185 HP per muffler - that works out about right for my ~360 HP 400 engine. They make a great sound, although there was an obnoxious "drone" around 1600 RPM at light throttle (cruise in O/D at about 50 MPH). I had noticed the same thing on another car I put those mufflers on and that issue seems to have gone away as I put miles on the car. Or maybe I just learned not to drive at that speed/load combo :-) I think the drone is getting less as I drive the GTO, too.
The headpipes are 2 1/4" in order to have enough clearance where the frame, starter & suspension monting points make for a tight fit.
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post #10 of 22 (permalink) Old 12-31-2012, 11:14 AM
 
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I went with Flowmaster Super 44's and love the deep rumble but I get a drone from 1800-2200 RPM. I have 2.5" pipes.

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