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Brian Cameron's Avatar
 
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Question Which Dansk muffler for SSI heat exchangers on 79 SC?

Freshening up my wifeís recently acquired 79 SC, pretty much stock and staying that way, at least for now.

The heat exchangers have rusted away from the pipes, and are loose and rattling, so i was able to get a spousal AFE to replace them with Dansk SSIís, #1623104910 (79 takes thin flange).

I understand these were for earlier cars up to Ď73 but are supposed to increase engine HP/torque a bit on the SC... and more is always better, right? I understand that different oil pipes will be needed too.

What Iím trying to figure out now is which muffler to get for the SSIís since they require a dual inlet muffler (the stock one is single inlet). Search found lots of threads but much of the info was subjective, and didnít fit our situation or desired outcomes. So, to help narrow the options down, hereís our criteria:

A. dual-in, single-out: to keep stock appearance and avoid cutting valence.

B. Sound: stock (60mm)or mild sport (70mm). 84mm would be too loud. Droning is verboten.

C. maximize power - not sure which ones make the most of the potential extra oomph of the SSIís, is there a difference.

D. Stainless would be nice but might have to go painted soft steel to keep within budget. Car will not see bad weather anyway.

Iím planning to stay with Dansk, whose website lists over a dozen mufflers, not including single-in, double-out, 84mm sport versions, etc. Variants include sport and regular, and stainless vs mild steel, but all of them seem to fall roughly into the three groupings described below.

So the question really boils down to this: which of the following 3 general types they offer would be the right (or best) muffler for the SSIís based on the criteria listed above? Conversely, are any of them poorly suited to this pairing?

Type 1: Dansk #1620609100 / 92.211OE
Reference: 911-111-025-01
Application:
911 (conversion), 3.0, 08/75-07/83
911/911S/911 Carrera, 2.7, 08/73-07/74

Type 2: Dansk #1620608700 / 92.101OE
OEM reference: 911-111-031-00
Application:
911 Carrera 3.2, 08/83-07/89.
911SC / 911 Carerra, 2.7-3.0, 08/75-07/83

Type 3: Dansk #1620607600 / 92.21
OEM reference: 911-111-011-05, 911-111-102-00
Application:
911S (mech injection, 2.4, 08/71-07/73). *
911T/E/S (not mech. Injection, 2.0-2.4, 01/63-07/73)

The full descriptions (no prices) can be viewed on the Dansk website, just select Porsche and use the search box at top for the 10 digit Dansk number, or use their full search feature lower down to see other examples. Website is: http://www.jpgroupclassic.com/products.aspx

Any experts out there who know which of these is the right option for the SSIís Iím getting?

Has anyone used any of these with their own SSIís (ideally on a 78 or 79 SC), and what did you think of them?

Thanks in advance,
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Old 01-10-2018, 10:08 PM
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Have a 3.0 with SSIs and a stainless Dansk Sport single out. Great sound at WOT but normally isn’t too loud. Easy to converse at highway speeds. doesn’t drone. Absolutely love it so much I moved it from a car I sold to the SC Super Chicken.
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Old 01-10-2018, 10:23 PM
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My '79 has the same setup as RSBob's. I like it. It helps the engine really rev out. Not too noisy but you can use it to wind the neighbours up if you really want to.
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Old 01-10-2018, 10:42 PM
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Brian … i would recommend an all ferrous metal dual in single out Bursch unit then if not then the same in a Dansk unit … It has been my experience over the past 30 years of porsche fun that given the same gauge thickness restraints stainless steel has it's own distinctive resonance pitch characteristics over that of ferrous metal and one can experience more drone at highway speeds with stainless then with an all ferrous metal muffler and especially when combining the overall thin walled stainless construction found in many of today's performance light weight units both with single or with the dual outlet set up … ferrous metal mufflers are most often then not constructed of a thicker gauge as it is cheaper to do so. To get away from increased propensity to droning, a heavier gauge thick metal is necessary when using stainless. So for some extra dollars Monty mufflers comes to mind which are heavier gauge stainless than other comparable stainless mufflers like Dansk and can offer you the dual out with little to no highway drone and is the only one I know of that has demonstrated dyno verifiable HP increase capabilities with SSI's over the other contenders …

The take away then is if droning and overall acceptable distinctive sound quality is of key concerns then find a thick gauge constructed muffler either in stainless or ferrous construction and use that as a starting point .. the lighter weight the unit the thinner wall the construction is used but the more prone to droning and various pitched chatty rattle and cackle you will experience …. just my experience and 3 cents - dave
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Last edited by antares; 01-10-2018 at 11:08 PM..
Old 01-10-2018, 10:59 PM
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Thanks gents. Sounds like sport is the way to go, only heard one complaint about droning from a targa owner who also had no engine sound pad so that might have been the proximate cause.

What does the butt dyno tell you, if you compared before & after?

And do you by chance have a record of which Dansk muffler (ie their part #) you installed? As noted there are quite a few variants...


Antares, thx for the pointers on thickness / resonance, i did consider the full Monty but the cost will cut too far into her shoe budget so don’t think I will get the ok on those.

Thx/ bc
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Last edited by Brian Cameron; 01-10-2018 at 11:10 PM..
Old 01-10-2018, 11:05 PM
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…. Then keep what you have on it or buy a inexpensive ferrous metal muffler and save up the extra
$ 400 or so and then buy and install the Monty because you will be glad you did in the long run and will save you from spending money now on something you no doubt will want to change after enduring a year of regrets … I have seen a lot of guys do this on this site but a lot of them have deep pockets but short memories yet end up buying the better muffler in the long run anyways …. dave
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Old 01-10-2018, 11:20 PM
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Put a Grey Painted stainless Dansk 2/1 on my car 6 years ago. Do not think it is a sport model. (Bought it used)
Grey paint flaked off, so it is now purely stainless for looks.
Opens up nicely with a great sound after 4K rpm, (have had many compliments from fellow enthusiasts) no drone ever.
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Old 01-10-2018, 11:53 PM
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I was considering a complete conversion kit from Dansk, 1620000310
The link may be a little more local for you to check out

http://store.concept1.ca/Exhaust-Kit-911-2.7-3.0-1620000310/

But I think I'll go with individual heat exchangers and a dual tip exhaust

1623102570, 1623102580, 1620605800
Old 01-11-2018, 01:27 AM
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Old 01-11-2018, 01:31 AM
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I think the Type 1, 1620609100, would be the best option for a stock 3.0
Old 01-11-2018, 01:37 AM
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Quote:
Originally Posted by jrbennett View Post




this is my favorite by far. love that twin pipe.
I don't know if it would sound different on a 3.0, but on the early cars it is awesome.
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Old 01-11-2018, 04:10 AM
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I have this setup with the 70mm sport in mild steel on my 79 SC. Very happy with it. No droning and gives a nice race sound when you twist ears.

Last edited by Claus Poulsen; 01-11-2018 at 05:04 AM..
Old 01-11-2018, 04:31 AM
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I have heard some of the dual outlets with the pipes on the ends, to me they sound like a truck with the muffler cut off. just my opinion of some of the new muffs
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Add another to the list, I have a stock SC with SSIs and the Dansk Sport 1-out. Excellent sound, mellow at cruise, no drone, spouse approved. Black painted steel but my car rarely sees weather so it still looks like new. I purchased the car with SSIs but replaced the OEM style muffler with the Sport, honestly I can't claim any meaningful performance gain but it sure sounds faster! Were I to do it again, I would do the exact same thing. My last 911 had a B&B 2-out, I like the sound of the Dansk better and it is definitely less obnoxious.
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Old 01-11-2018, 08:27 AM
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i know mine is a rather lonely opinion, but i too have changed to SSI's on my 81 SC, and first tried it with a SS dansk sport - one outlet. The small outlet variant.
My car is a targa, and i have no soundpad, so who knows that adds to the noise, but i found the SS mufler very droning at low rpm. It was very loud to get to ca. 3000rpm, and from then on it was fine (actually pretty quiet at full song). Very annoying at 2500 rpm, and as a daily car, you spend a lot of time around that rpm. Unbearable for me.

I swapped the dansk SS for a new 'stock' old steel banana, painted grey, i never looked at the brand, so can't tell you, but this exhaust is perfect for me. It is relatively quiet when you are driving normally (as far as you can call a 37 year old targa quiet) and sings a beautiful song when you step on it. I see no reason whatsoever to have a louder car than this, it's already 5 times louder than anything else on the road
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Old 01-12-2018, 11:57 AM
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SSI + Dansk (NOS, Porsche branded) 2-1. I had another 2-2 muffler but I sold it off, way too noisy and drony for my taste. Most of the HP gain for me came from SSIs, not muffler. Noticed no difference when changing mufflers vs. huge difference going from stock HE to SSI. 82 SC.
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Old 01-12-2018, 12:19 PM
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Quote:
Originally Posted by Brian Cameron View Post
B. Sound: stock (60mm)or mild sport (70mm). 84mm would be too loud.
When talking about SSI/Dansk is tail pipe diameter directly proportional to the loudness of a muffler or just for looks?
Old 01-12-2018, 02:32 PM
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Ö so what's all this jawing about what the spouses approval is on this n that Ö if they don't like they can just Ö...

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Old 01-12-2018, 07:12 PM
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It’s her car.

So I think she is reasonably entitled to some say in the project, no?
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