#1  
Old 07-10-2020, 04:35 PM
alanmay0 alanmay0 is offline
Chief Ponti-yacker
 
Join Date: Nov 2017
Location: Texas
Posts: 612
Default 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

  #2  
Old 07-10-2020, 08:14 PM
Tom Hand's Avatar
Tom Hand Tom Hand is offline
Exhaust Guru
 
Join Date: Dec 1999
Location: Lee's Summit, MO, USA
Posts: 994
Default

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.)

__________________
Tom Hand
  #3  
Old 07-11-2020, 07:00 AM
67GTONUT's Avatar
67GTONUT 67GTONUT is offline
Ultimate Warrior
 
Join Date: May 2003
Location: Rockaway, NJ, USA
Posts: 1,501
Default

Walker DynoMax Ultra Flo Welded....

Been running em on all my cars since the 80's

https://www.dynomax.com/mufflers/ult...elded-mufflers

__________________
Troy
Rockaway NJ
67 GTO
400HO / TKX 3.27 1ST GEAR-.72OD / 3.36 POSI
HOTCHKIS/UMI/BILSTEIN
  #4  
Old 07-11-2020, 08:39 AM
Murf Murf is offline
Ultimate Warrior
 
Join Date: Aug 2000
Location: St. Marys Ks. U.S.A.
Posts: 1,486
Default

Quote:
Originally Posted by 67GTONUT View Post
Walker DynoMax Ultra Flo Welded....



Been running em on all my cars since the 80's



https://www.dynomax.com/mufflers/ult...elded-mufflers


^ This, 2.5 offset/center , don’t drone on our car with x pipe.


Sent from my iPhone using Tapatalk Pro

  #5  
Old 07-11-2020, 09:27 AM
MUSLCAH MUSLCAH is offline
Ultimate Warrior
 
Join Date: Sep 2015
Location: N.H.
Posts: 1,920
Default

Flow Masters here.....loud and proud..19 inch

  #6  
Old 07-11-2020, 10:45 AM
The Champ's Avatar
The Champ The Champ is offline
Ultimate Warrior
 
Join Date: May 2002
Location: Rochester, MN
Posts: 2,534
Default

Quote:
Originally Posted by alanmay0 View Post
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
Walker DynoMax Super Turbo - 17749

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.
Attached Thumbnails
Click image for larger version

Name:	DSC_0004.jpg
Views:	260
Size:	60.6 KB
ID:	544728   Click image for larger version

Name:	DSC_0005.jpg
Views:	265
Size:	73.4 KB
ID:	544729  

  #7  
Old 07-11-2020, 11:11 AM
Formulajones's Avatar
Formulajones Formulajones is online now
Ultimate Warrior
 
Join Date: Jan 2012
Posts: 10,792
Default

Another vote for the Dynomax Ultraflows.

__________________
2019 Pontiac Heaven class winner

https://youtu.be/XqEydRRRwqE
  #8  
Old 07-11-2020, 11:29 AM
hgerhardt's Avatar
hgerhardt hgerhardt is offline
Chief Ponti-yacker
 
Join Date: Dec 2003
Location: CA
Posts: 654
Default

And another vote for Walker DynoMax Super Turbo - 17749

  #9  
Old 07-11-2020, 11:43 AM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 31,294
Default

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

__________________
"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.
  #10  
Old 07-11-2020, 12:45 PM
Gator67's Avatar
Gator67 Gator67 is offline
Ultimate Warrior
 
Join Date: Jul 2009
Location: North Scottsdale
Posts: 1,640
Default

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.

__________________
"If the best Mustang is the Camaro, the best Camaro is actually the Firebird" David Zenlea
  #11  
Old 07-11-2020, 01:07 PM
ta man ta man is offline
Ultimate Warrior
 
Join Date: Apr 2006
Location: Clinton,Ontario,Canada
Posts: 5,348
Default

Another vote for Ultraflows..my car is quiet inside at 70mph..with 3 inch exhaust and 600hp. I have a video somewhere.

__________________

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
  #12  
Old 07-11-2020, 01:34 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 31,294
Default

Quote:
Originally Posted by Tom Vaught View Post
I have the Walker DynoMax Super Turbo - 17749 Mufflers Tom Vaught
I was very happy with the 17749 Mufflers previously.

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.
  #13  
Old 07-11-2020, 01:49 PM
lust4speed's Avatar
lust4speed lust4speed is offline
Ultimate Warrior
 
Join Date: Jul 2002
Location: Yucaipa, SoCal
Posts: 8,684
Default

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.

__________________
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.
  #14  
Old 07-11-2020, 02:32 PM
The Champ's Avatar
The Champ The Champ is offline
Ultimate Warrior
 
Join Date: May 2002
Location: Rochester, MN
Posts: 2,534
Default

Quote:
Originally Posted by Tom Vaught View Post
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
Looked this up after your post. Sounds VERY interesting. There was no pricing info on the website - what kind of price?

I like the idea of being able to change the tone and volume on demand without electric operated cutouts....

  #15  
Old 07-11-2020, 02:52 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 31,294
Default

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.
  #16  
Old 07-11-2020, 03:57 PM
Steve C. Steve C. is offline
Ultimate Warrior
 
Join Date: Dec 1999
Location: Liberty Hill, Tx. (Austin)
Posts: 10,385
Default

Still around ?

Driver Controlled Exhaust (DCE) muffler

For a brief period in 1969 & 1970, GTO buyers were able to purchase an option known as “Vacuum Operated Exhaust”. It was one of the industry’s most unusual options; dual-mode mufflers - controlled by the driver - that could be operated in “Quiet” or “Tiger” (Open) modes.


http://waldronexhaust.com/drivercontrolledexhaust.htm



.

__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 )
Old information here:
http://www.hotrod.com/articles/0712p...tiac-trans-am/

Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine)
5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension
https://www.youtube.com/watch?v=qDoJnIP3HgE
  #17  
Old 07-11-2020, 04:37 PM
Tom Hand's Avatar
Tom Hand Tom Hand is offline
Exhaust Guru
 
Join Date: Dec 1999
Location: Lee's Summit, MO, USA
Posts: 994
Default

Thanks Tom. I am building sets right now for the original GTO from the commercial. A set mainly the owner can use to drive the car with to save the original ones (priceless almost). The restored car is to be done by the MCACN show in Chicago this winter.

This round has been four sets, I did one set last year for a very rare and special 64 GTO in Michigan and then the other 6-8 sets or so out there were from 2003 to 2006. One of these is on my 69 Barracuda. They still work well and still sound great with zero drone but all sorts of roar when open.

Here is one of the latest going on the "commercial" GTO. Once I saw the OEM ones and got more data, I changed the outlet side a bit to be more correct.
Attached Thumbnails
Click image for larger version

Name:	fullsizeoutput_54be.jpg
Views:	185
Size:	48.9 KB
ID:	544761   Click image for larger version

Name:	fullsizeoutput_54bf.jpg
Views:	160
Size:	50.4 KB
ID:	544762  

__________________
Tom Hand
  #18  
Old 07-11-2020, 07:06 PM
Formulajones's Avatar
Formulajones Formulajones is online now
Ultimate Warrior
 
Join Date: Jan 2012
Posts: 10,792
Default

Quote:
Originally Posted by Steve C. View Post
Still around ?

Driver Controlled Exhaust (DCE) muffler

For a brief period in 1969 & 1970, GTO buyers were able to purchase an option known as “Vacuum Operated Exhaust”. It was one of the industry’s most unusual options; dual-mode mufflers - controlled by the driver - that could be operated in “Quiet” or “Tiger” (Open) modes.


http://waldronexhaust.com/drivercontrolledexhaust.htm



.

I was going to say pretty sure Waldron was still selling those switch operated mufflers.

I also like his line of Imposter mufflers, that look stock, but offer more flow and sound. He builds to order so there is a 10-12 week waiting period.

__________________
2019 Pontiac Heaven class winner

https://youtu.be/XqEydRRRwqE
  #19  
Old 07-11-2020, 08:49 PM
Tom Hand's Avatar
Tom Hand Tom Hand is offline
Exhaust Guru
 
Join Date: Dec 1999
Location: Lee's Summit, MO, USA
Posts: 994
Default

Waldron's has not been able to get what they need to sell them anymore. Not sure if or when they will be able to supply them again......

__________________
Tom Hand
  #20  
Old 07-11-2020, 11:29 PM
b-man's Avatar
b-man b-man is offline
Moderator
 
Join Date: Sep 2002
Location: Sunny So Cal
Posts: 16,410
Default

Quote:
Originally Posted by The Champ View Post
Walker DynoMax Super Turbo - 17749

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.
My favorite muffler for the street, I have a pair on my ‘64 Le Mans convertible.

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
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:38 AM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017