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PopUpProject
Joined: 06 Aug 2025
Posts: 111
Location: NE Ohio
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 Posted: Thu Sep 25, 2025 11:17 pm Post subject: '88 944 exhaust on an '82 924 |
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Hey guys I found this old post from the old board:
"PostPosted: Tue Feb 01, 2000 11:31 pm Post subject: Reply with quote
From: Eric
Email: iapetus@mediaone.net
Date: 2/2/00
Time: 2:31:25 PM
I have been looking for an after market exhaust for my 79 na 924, I havent found one that I like the looks of..... so my question is, can a 944 exhaust be modified to fit on the 924? If so are there any performance issues?
Also, I would like to hear some feedback from people using after market fuel management systems. What brands? Are they any better? and are they difficult to install?
Thanks in advance
PostPosted: Wed Feb 02, 2000 1:03 am Post subject: Reply with quote
From: Vince
Email: Ponzv@aol.com
Date: 2/2/00
Time: 4:03:47 PM
I have used a Stahl header without a cat and a Supertrapp.Without the plates the think was great but noisy. Adding plates made the car quiter but still loud.
Changed to a 944 muffler and it quited it down. Took some power away.
Then changed to a turgomax and it was not any better. For sound take the 944 muffler.
For track performance use the supertrapp.
Anything else email me.
PostPosted: Wed Feb 02, 2000 9:54 am Post subject: Reply with quote
From: wayne
Email: spkprobe @aol.com
Date: 2/3/00
Time: 12:54:43 AM
the 944 eghaust will fit the 924 get it from after cat. back, ther might be so mod required but it is minor and you will end up with a excellent eghaust system. But remember the rear pan is just a resonator so you will need the muffler under the car for noise control. Order the bursch header system, look thru excellence you will find a ad for one. i had good results with this combination on my 924. and should be the first mod bar none on this engine. Anther easy mod is use the throttle body from 86-91 vw golf /jetta etc. it was much bigger than stock. try integral cams for a replacement cam. open up the snorkel on the air box. I run the DTA engine mangement system on my 924 gts replica and it make a big difference but these systems can be pricy and unless you plan on doing more modification than was suggested stick with the cis.
Wayne
PostPosted: Mon Feb 14, 2000 6:14 pm Post subject: Reply with quote
From: Vaughan
Email: vscott39@hotmail.com
Date: 2/15/00
Time: 9:14:04 AM
This mod has been recommended by Don Istook as the most cost-effective performance exhaust option for the 924. However, yes, it does require soem work with the hangers to get it to work.
Vaughan"
Does anyone have any pictures for what the modifications look like? I snagged a '88 944 exhaust from an '88 924S after the cat and back (the cat had been chopped off so could only take from there back) and I thought it would bolt right up until stumbling upon this post...
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Raize
Joined: 18 Sep 2013
Posts: 445
Location: Scotland
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| Posted: Fri Sep 26, 2025 4:16 am Post subject: |
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Can be done without welding in theory.
You'll need a pipe which fits into the 924 centre silencer slip joint at one end.
And a 3-bolt flange to match the 944 flange at the other end. These are available on ebay with pipe stubs. You'll need to match the bolt pattern and ID/OD.
And you'll also need a way to join these two together - a regular exhaust joiner clamp if you're lucky, a flexible joint type one if you're not and the flanges are misaligned. |
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Fri Sep 26, 2025 11:25 pm Post subject: |
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Thanks Raize! I'm guessing we have either a 2 bolt flange (if that's a thing) or a different flange set up than the 944s?
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Raize
Joined: 18 Sep 2013
Posts: 445
Location: Scotland
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| Posted: Sat Sep 27, 2025 1:29 am Post subject: |
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| PopUpProject wrote: | | Thanks Raize! I'm guessing we have either a 2 bolt flange (if that's a thing) or a different flange set up than the 944s? |
We don't have a flange at all, we have a slip joint and it's not in the same place either.
I'd recommend keeping the centre silencer as it will be very noisy otherwise. |
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Sat Sep 27, 2025 2:01 am Post subject: |
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| Raize wrote: | | PopUpProject wrote: | | Thanks Raize! I'm guessing we have either a 2 bolt flange (if that's a thing) or a different flange set up than the 944s? |
We don't have a flange at all, we have a slip joint and it's not in the same place either.
I'd recommend keeping the centre silencer as it will be very noisy otherwise. |
This is the 944 exhaust, I think the thingy on the far end is the center silencer? Maybe? Maybe a resonator if that's different from a center silencer?https://drive.google.com/file/d/1f8mTDR3Zhz8IRIagptjkVp213ffrT3Xo/view?usp=drive_link I'm still learning what technical names are on things, so forgive my stupidity
I mostly wanted the new-to-me suitcase/muffler because Poppy's has so many holes I can see daylight through it and I'm trying to not just straight pipe her lol
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Raize
Joined: 18 Sep 2013
Posts: 445
Location: Scotland
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| Posted: Sat Sep 27, 2025 11:59 pm Post subject: |
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| That doesn't look like any 944 exhaust I know. May be a custom one - looks shiny so possibly is a stainless custom exhaust. Has a superficial resemblance to the 924 2.0 exhaust. Do you have a photo of the other end? |
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Sun Sep 28, 2025 9:35 am Post subject: |
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| Raize wrote: | | That doesn't look like any 944 exhaust I know. May be a custom one - looks shiny so possibly is a stainless custom exhaust. Has a superficial resemblance to the 924 2.0 exhaust. Do you have a photo of the other end? |
The only reason I'm calling it a 944 exhaust is because of a stamp/plate I found on it, but here's the stamp and the other end of the exhaust https://drive.google.com/drive/folders/1a_b0b1DcbxQOb58Aja22JHqRYvCkbsow?usp=sharing. I thought it was an aftermarket 924S exhaust until we flipped it over and saw the stamp on it.
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Raize
Joined: 18 Sep 2013
Posts: 445
Location: Scotland
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| Posted: Sun Oct 05, 2025 6:38 am Post subject: |
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Well it has a 3 bolt triangle flange like a 944 exhaust but I would have thought it's too far forward to bolt up to a 944 system.
So basically you need a bit of pipe with the appropriate triangle flanges on each end and you're sorted. Maybe a mount, I bet you could make a sort of 924 exhaust hanger out of a U-bolt clamp and some bent plate. |
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Tue Oct 07, 2025 5:48 am Post subject: |
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| Raize wrote: |
So basically you need a bit of pipe with the appropriate triangle flanges on each end and you're sorted. Maybe a mount, I bet you could make a sort of 924 exhaust hanger out of a U-bolt clamp and some bent plate. |
oh bet. Once we get her up in the air and I can do some good staring at what we got going on underneath, I'll take some more pictures, measure, and see what we come up with. Poppy is gunna end up with some form of a custom oem-ish exhaust one way or another XD
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Wed Oct 15, 2025 1:12 pm Post subject: |
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| Raize wrote: |
So basically you need a bit of pipe with the appropriate triangle flanges on each end and you're sorted. Maybe a mount, I bet you could make a sort of 924 exhaust hanger out of a U-bolt clamp and some bent plate. |
Hey Raize, we finally got Poppy up in airjail and ohhhhhhhhhhhhhhhhh boy am I in for a long and hard ride with this car. I will be making a whole other post about my findings separate from my exhaust findings.
I don't have a slip joint? I think? Unless its so rusted that its just formed one piece. My cat and resonator/center silencer have flanges but they're smaller than the flanges on the 944 exhaust so I think I'll have to play the game of figure out how/where to chop and add a new flange. We might end up cutting up past all of that, chopping off the 944 flange, and sticking a tube all the way up to near the Y because so. much. rust. Also, almost all of my exhaust hangers are nonexistent which is so fun. I added a video of what the chaos of the exhaust looks like to the google drive I shared before.
Any other wise words of wisdom?
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Poppy the '82 924 Resurrection in Progress |
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Raize
Joined: 18 Sep 2013
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Location: Scotland
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| Posted: Sat Oct 18, 2025 5:39 am Post subject: |
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| PopUpProject wrote: | | Raize wrote: |
So basically you need a bit of pipe with the appropriate triangle flanges on each end and you're sorted. Maybe a mount, I bet you could make a sort of 924 exhaust hanger out of a U-bolt clamp and some bent plate. |
Hey Raize, we finally got Poppy up in airjail and ohhhhhhhhhhhhhhhhh boy am I in for a long and hard ride with this car. I will be making a whole other post about my findings separate from my exhaust findings.
I don't have a slip joint? I think? Unless its so rusted that its just formed one piece. My cat and resonator/center silencer have flanges but they're smaller than the flanges on the 944 exhaust so I think I'll have to play the game of figure out how/where to chop and add a new flange. We might end up cutting up past all of that, chopping off the 944 flange, and sticking a tube all the way up to near the Y because so. much. rust. Also, almost all of my exhaust hangers are nonexistent which is so fun. I added a video of what the chaos of the exhaust looks like to the google drive I shared before.
Any other wise words of wisdom? |
I chopped the downpipe before the flange and just welded a tube and a flange to it to mate directly to my 944 rear exhaust section.
Welding carbon steel to stainless steel, I will probably pay the price for that one day but so far so good after 5-6 years. And hey, if it breaks it would be super easy to make another.
You do have a slip joint. It's where the U-bolt clamp is. Guess it has a catalytic convertor too, are you allowed to get rid of that? |
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Sat Oct 18, 2025 7:26 am Post subject: |
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| Raize wrote: |
I chopped the downpipe before the flange and just welded a tube and a flange to it to mate directly to my 944 rear exhaust section.
Welding carbon steel to stainless steel, I will probably pay the price for that one day but so far so good after 5-6 years. And hey, if it breaks it would be super easy to make another.
You do have a slip joint. It's where the U-bolt clamp is. Guess it has a catalytic convertor too, are you allowed to get rid of that? |
I did some measuring and it actually seems like the flanges are the same size. It just looks real funky when eyeballing because how much bigger everything is on the 88 exhaust compared to Poppy's current. I just have to fight bluetooth bolts and make some hangers it seems like if we decide to keep the cat.
Technically I should have a cat but because the car is older than 25 yrs and can be called an antique I don't have to go through emissions and can get away with more things. My cat probably doesn't do anything in its current state if were being honest. But if I can bolt up to it that would make life a lot easier.
And yes I found the U bolt clamp. The slip joint is no longer a slip joint. It has formed one piece via rust 
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Poppy the '82 924 Resurrection in Progress |
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Sat Oct 18, 2025 1:50 pm Post subject: |
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| PopUpProject wrote: |
I did some measuring and it actually seems like the flanges are the same size. It just looks real funky when eyeballing because how much bigger everything is on the 88 exhaust compared to Poppy's current. I just have to fight bluetooth bolts and make some hangers it seems like if we decide to keep the cat.
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Update: We chopped off the exhaust at the flange to the cat. The flange is slightly too small after I held it up to the 944 flange.
So we're probably going to go catless and get creative joining up the pieces with some extra pipe. Good news is the resonator was HEAVILY restricting Poppy because it was so full of rusty shit and cat chunks that she ran even better than she was before. The amount of chunks that flew out the cat was pretty funny. Some point in the near future we'll mock up the 944 exhaust and see what ends up happening
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Poppy the '82 924 Resurrection in Progress |
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Raize
Joined: 18 Sep 2013
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Location: Scotland
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| Posted: Sun Oct 19, 2025 6:18 am Post subject: |
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| PopUpProject wrote: | | PopUpProject wrote: |
I did some measuring and it actually seems like the flanges are the same size. It just looks real funky when eyeballing because how much bigger everything is on the 88 exhaust compared to Poppy's current. I just have to fight bluetooth bolts and make some hangers it seems like if we decide to keep the cat.
|
Update: We chopped off the exhaust at the flange to the cat. The flange is slightly too small after I held it up to the 944 flange.
So we're probably going to go catless and get creative joining up the pieces with some extra pipe. Good news is the resonator was HEAVILY restricting Poppy because it was so full of rusty shit and cat chunks that she ran even better than she was before. The amount of chunks that flew out the cat was pretty funny. Some point in the near future we'll mock up the 944 exhaust and see what ends up happening |
I didn't realise it actually ran, that's good. Must have been hella loud with no silencers.
I seem to remember I managed to just buy a pre-made triangle flange off EBAY that worked with the 944 exhaust. Easiest just to make the two flanges a face seal rather than messing around with the metal o-ring like I did.
So just get some pipe and a flange, tack weld it in position on the car, then take it off and finish the welding. |
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PopUpProject
Joined: 06 Aug 2025
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Location: NE Ohio
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| Posted: Mon Oct 20, 2025 11:34 pm Post subject: |
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| Raize wrote: |
I didn't realise it actually ran, that's good. Must have been hella loud with no silencers.
I seem to remember I managed to just buy a pre-made triangle flange off EBAY that worked with the 944 exhaust. Easiest just to make the two flanges a face seal rather than messing around with the metal o-ring like I did.
So just get some pipe and a flange, tack weld it in position on the car, then take it off and finish the welding. |
She was very loud XD And yeah somehow despite all of her issues she runs and drives. Just now no exhaust and still no brakes XD but sounds like a plan, I'll have to do some measuring and get looking
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