 making a GT muffler from an old banana muffler, what size should i make the outlets? |
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| pete-stevers |
 Oct 12 2023, 04:44 PM
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#1
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saved from fire!  Group: Members Posts: 2,641 Joined: 10-October 04 From: Abbotsford,BC, Canada Member No.: 2,914 Region Association: Pacific Northwest 
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I have an old banana mufller I would like to put the two GT outlets into... (IMG:style_emoticons/default/idea.gif)
Where should I put the outlets, and what size should they be. I am putting in a small bore six (IMG:style_emoticons/default/smile.gif) |
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| Cairo94507 |
Oct 12 2023, 04:58 PM
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#2
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Michael Group: Members Posts: 9,759 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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Hi Pete- I would think 2.5" pipes would be about right; do you want the traditional GT look or the newer GT style with the pipes close together? (IMG:style_emoticons/default/beerchug.gif)
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| mb911 |
Oct 12 2023, 06:27 PM
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#3
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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GT 3 look is my vote 2.5” is what these are
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| sixaddict |
Oct 13 2023, 06:49 AM
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#4
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Senior Member Group: Members Posts: 801 Joined: 22-January 09 From: Panama City Beach, FL Member No.: 9,961 Region Association: South East States
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Ben
I want to piggy back on this question….he said small bore six. Does the 2.5 still hold…..as headers vary based on bore. I was under impression too large a pipe may not provide sufficient back pressure. May not change your answer …..but just want to confirm. Thanks |
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| Cairo94507 |
Oct 13 2023, 06:58 AM
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#5
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Michael Group: Members Posts: 9,759 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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@mb911 - That muffler looks awesome and I bet it sounds good too. (IMG:style_emoticons/default/beerchug.gif)
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| pete-stevers |
Oct 13 2023, 09:10 AM
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#6
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saved from fire! Group: Members Posts: 2,641 Joined: 10-October 04 From: Abbotsford,BC, Canada Member No.: 2,914 Region Association: Pacific Northwest
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QUOTE(Cairo94507 @ Oct 12 2023, 03:58 PM)  Hi Pete- I would think 2.5" pipes would be about right; do you want the traditional GT look or the newer GT style with the pipes close together? (IMG:style_emoticons/default/beerchug.gif) I think the original GT spacing would be preferred. Although close together looks great as well! |
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| sixnotfour |
Oct 13 2023, 10:49 AM
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#7
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914 Wizard Group: Members Posts: 10,430 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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old article how to...
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| Ottomotion |
Oct 13 2023, 11:05 AM
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#8
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Newbie Group: Members Posts: 45 Joined: 12-January 23 From: Central California Member No.: 27,090 Region Association: None |
QUOTE(sixnotfour @ Oct 13 2023, 11:49 AM) old article how to... Neat modification I assume this can be done similarly to the 4 Cyl Banana muffler for those of us who can afford a muffler mod but not a 6 yet? Backpressure probably an issue.... |
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| Literati914 |
Oct 13 2023, 12:33 PM
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#9
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Senior Member Group: Members Posts: 1,461 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region |
I also planned this mod some time ago and haven’t gotten to it yet.. I was thinking that if the sound level is greater than desired, I should be able to add aftermarket sound baffle inserts (like are used with motorcycle exhausts to quiet them) into the two exit pipes. Perhaps that would add back pressure too, if found to be beneficial. Just a thought.
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| Chris914n6 |
Oct 13 2023, 12:46 PM
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#10
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Jackstands are my life. Group: Members Posts: 3,320 Joined: 14-March 03 From: Las Vegas, NV Member No.: 431 Region Association: Southwest Region |
^^ there is nothing quiet about a sport muffler and with the car I was in, it got really loud between 3,000-3,500 RPM.
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| mb911 |
Oct 13 2023, 01:39 PM
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#11
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(sixaddict @ Oct 13 2023, 04:49 AM) Ben I want to piggy back on this question….he said small bore six. Does the 2.5 still hold…..as headers vary based on bore. I was under impression too large a pipe may not provide sufficient back pressure. May not change your answer …..but just want to confirm. Thanks I run a tail pipe blocked off to keep it tame and works well for my 2.4 with 993 heat exchangers |
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| Literati914 |
Oct 13 2023, 02:40 PM
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#12
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Senior Member Group: Members Posts: 1,461 Joined: 16-November 06 From: Dallas, TX Member No.: 7,222 Region Association: Southwest Region |
Regarding high decibels.. since the body has to be cut open to make changes anyway - is there a modern muffler packing product that could be added before closing it up? Why is steel wool coming to mind (IMG:style_emoticons/default/screwy.gif) (IMG:style_emoticons/default/confused24.gif)
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