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#1
07-10-2020, 04:35 PM
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mufflers for a 1967 GTO
I know there are a lot of post about exhaust and mufflers but nothing that answered my question. So I would like to put new mufflers on my GTO. I have 2.5" exhaust pipes. I currently have mufflers from Summit that I do not like. I want mufflers that have little to no drone and that have a nice sound to them but not too loud especially when going down the highway at 70 mph or 2800 rpm's.
Thank you Alan |
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#2
07-10-2020, 08:14 PM
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Alan, shoot a picture under the car to show what you have now and what size they are and what configuration they are (inlet offset, outlet offset, etc.)
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Tom Hand |
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#3
07-11-2020, 07:00 AM
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Walker DynoMax Ultra Flo Welded....
Been running em on all my cars since the 80's https://www.dynomax.com/mufflers/ult...elded-mufflers
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Troy Rockaway NJ 67 GTO 400HO / TKX 3.27 1ST GEAR-.72OD / 3.36 POSI HOTCHKIS/UMI/BILSTEIN 
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#4
07-11-2020, 08:39 AM
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Quote:
^ This, 2.5 offset/center , don’t drone on our car with x pipe. Sent from my iPhone using Tapatalk Pro |
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#5
07-12-2020, 08:43 AM
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different exhaust sound not expected
This is why I was looking for a different set of mufflers.
OK so I bought the intake manifold gasket kit that included the piece that you could use to cover the crossover exhaust ports on the intake manifold thinking this would help the paint from discoloring on the manifold. There is an unexpected side result of covering these ports. The exhaust, at least on my car, sounds much different. when under mild to heavy acceleration the exhaust sounds kind of like a machine gun being shot. Not quite as loud as a machine gun but this is the best way I can explain it. Has anyone else experienced this??? Do you think a different muffler might stop this sound. Does anyone know why it has changed the sound???? Thank you |
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#6
07-12-2020, 09:37 AM
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Blocking the exhaust crossover is pretty common to reduce the heat transfer to the carb. On my Olds 403 and on Curt's Pontiac 400 we blocked the crossover for that reason since we race the cars and are looking for any little benefit we can find. We also have x-pipe crossovers which change the exhaust tone to some degree, but in any case there is no drone or the 'popping' sound like you describe in your current setup.
__________________
69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car. 79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet. |
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#7
07-11-2020, 09:27 AM
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Flow Masters here.....loud and proud..19 inch
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#8
07-11-2020, 10:45 AM
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Quote:
It's quieter than the Ultra Flo, but far from silent at wide open throttle... https://www.dynomax.com/mufflers/sup...set-17926.html This is what I have on my '64 convertible and I opted for the Super Turbo vs the Ultra Flo to make sure I could hear my stereo while driving on the highway with the top down. |
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#9
07-11-2020, 11:11 AM
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Another vote for the Dynomax Ultraflows.
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#10
07-11-2020, 11:29 AM
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And another vote for Walker DynoMax Super Turbo - 17749
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#11
07-11-2020, 11:29 PM
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Quote:
An overly loud exhaust on a convertible takes the pleasure out of driving one, even with the top up.
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#12
07-12-2020, 07:41 AM
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I run the Dynomax Super turbos on the Trans Am and my son runs the Ultra Flows on the Bird. Both are great mufflers; just depends on what level of noise you are comfortable with for street driving.
__________________
69 Bird w/1970 400 block(409 cubes), #64 heads, hyd. roller, Q-jet by Jeff E., original interior, ps, pdb, th350, and 3.73 gears. Pump gas, street driven muscle. 3800 lbs. race weight. Best, 11.39 @118, my son's car. 79 T/A w/463, Scat crank, Eagle rods, Icon pistons, Lunati solid roller, 262/270, KRE 325 heads, Northwind intake, QF950 carb, full interior, ps, pdb, th350, and 3.73 gears. Pump gas, 3650 lbs. race weight. 10.68 @ 126 so far... no tuning yet. |
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#13
07-11-2020, 11:43 AM
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I have the Walker DynoMax Super Turbo - 17749 Mufflers but it is time to test out Tom Hand's VOE system on my 64 GTO so that will be what I am installing next.
Thanks again Tom Hand. Tom Vaught
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#14
07-11-2020, 01:34 PM
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Quote:
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#15
07-11-2020, 02:32 PM
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Quote:
I like the idea of being able to change the tone and volume on demand without electric operated cutouts.... |
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#16
07-11-2020, 12:45 PM
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I used the 14" Race Pros on my 67 GTO fo about 8 years (they came with the 2.5" Pypes exhaust system I installed). I switched them out for the longer case Dynomax Super Turbos 17749 to get rid of the annoying drone. They work great, but may be too quiet for those who want a more aggressive sounding exhaust system. Inexpensive and easy to swap out, although if you have a shorter muffler now, it will require some trimming.
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"If the best Mustang is the Camaro, the best Camaro is actually the Firebird" David Zenlea |
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#17
07-11-2020, 01:07 PM
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Another vote for Ultraflows..my car is quiet inside at 70mph..with 3 inch exhaust and 600hp. I have a video somewhere.
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 466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
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#18
07-11-2020, 01:49 PM
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Walker Dyno Max Super Turbos have cured so many ills on our club members' cars. Has a low throaty idle that just never gets obnoxious as the RPM's increase.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#19
07-16-2020, 05:22 PM
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Quote:
__________________
Jeff 
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#20
07-11-2020, 02:52 PM
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5 or 6 PY members signed up to pay for part of the project costs (and it return would receive a set of stainless VOE mufflers). Tom and his people did a great job on the initial experiment. I believe are a couple of videos out there with the Vehicle equiped with the original Tom Hand VOE mufflers.
I assume the current guy making them worked a deal with Tom somewhere in the history and is not selling/"making" the mufflers. No knowledge of his later work. I have a set of the Tom Hand originals, Pontiac Jack has a set, and Tom Hand could maybe tell you who the others are IF they agree. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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