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Quote:
Originally Posted by scarceller View Post
Frank, I think this muffler should work well for you and with a decent sound.

While you are installing could you possibly estimate the length of the runners from the head to the collector? Use a string to get an estimate, then measure the string. I'd like to know how long the runners are.

Thanks.
I finished the install before I saw your note. I will get your measurement next time she's on the lift.

Quote:
Originally Posted by dubby911 View Post
This old man went with Sri and Dan’s on a 83 cab. Why because I got frugal. If I was ding it again I would be all in on monty
I'll get around to giving the Monty a try when I can get my hands on one.

In the meantime, mounting requires the stock 3.2 Carrera muffler mount and two of the shorter length muffler straps, 930 111 159 00.









Here's the startup sound clip...



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Frank Amoroso
911 M491 / M470 coupes:
1987 GP Wht / Blk "Apollo"
1987 Gemini Blue / Blk "Gemini"
1989 GP Wht / Blk "Vents"
Old 02-23-2023, 06:39 PM
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Quote:
Originally Posted by dubby911 View Post
This old man went with Sri and Dan’s on a 83 cab. Why because I got frugal. If I was ding it again I would be all in on monty
I just heard back from Monty Mufflers regarding my 2 in / 1 out for a 3.2 Carrera inquiry. The good news is that they responded quickly. The BAD news is that they responded with... "Sorry. No longer in production."

Well, that blows. Short of finding a used Monty to try, I guess I'll just focus on the right SCART to compare.
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Frank Amoroso
911 M491 / M470 coupes:
1987 GP Wht / Blk "Apollo"
1987 Gemini Blue / Blk "Gemini"
1989 GP Wht / Blk "Vents"
Old 02-24-2023, 05:01 AM
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Frank,

Not sure if you are done with your muffler search or if these guys can do the 2 in 1 but I've always been intrigued by DW out of Germany.

https://www.dw-technik.de/produkte1/01_dw1170.php

https://www.youtube.com/watch?v=PJ2u6GuxVnE&list=LL&index=90&t=426s
Old 02-24-2023, 05:36 AM
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Hey Frank,
I just wanted to chime in as I have FINALLY finished my muffler/header saga on my m491 and i have to say it is perfect. I bought the set up used and found out later that it was made by motorwerksracing here local to me in the Atlanta region. It sound unlike other systems, more sporty and modern, very clean and smooth, great in idle, not too loud at all, NO DRONE!,GT3 style exhaust, plus it basically uses the muffler to make the heat for the cabin so you don't have to run the ugly header covers i really don't like. Yes it makes plenty heat. I try to make a sound video of mine in the next few days.

Motor Werks Racing Porsche Headers & Exhaust Systems — Motor Werks Racing

Old 02-24-2023, 08:27 AM
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Quote:
Originally Posted by Classic11 View Post
Hey Frank,
I just wanted to chime in as I have FINALLY finished my muffler/header saga on my m491 and i have to say it is perfect. I bought the set up used and found out later that it was made by motorwerksracing here local to me in the Atlanta region. It sound unlike other systems, more sporty and modern, very clean and smooth, great in idle, not too loud at all, NO DRONE!,GT3 style exhaust, plus it basically uses the muffler to make the heat for the cabin so you don't have to run the ugly header covers i really don't like. Yes it makes plenty heat. I try to make a sound video of mine in the next few days.

Motor Werks Racing Porsche Headers & Exhaust Systems — Motor Werks Racing


Do you have any images of this setup? I am curious about the heat through muffler. And, I am interested in the sound bite when you get it made.
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Old 02-24-2023, 08:45 AM
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Quote:
Originally Posted by famoroso View Post
I just heard back from Monty Mufflers regarding my 2 in / 1 out for a 3.2 Carrera inquiry. The good news is that they responded quickly. The BAD news is that they responded with... "Sorry. No longer in production."

Well, that blows. Short of finding a used Monty to try, I guess I'll just focus on the right SCART to compare.
The Dansk flows and sounds a lot better.
Old 02-24-2023, 09:31 AM
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Agree! The Dansk muffler you have does really well. If you dynoed before you installed those headers and muffler go back to the dyno, you will be really surprised with the results.

Quote:
Originally Posted by Steve W View Post
The Dansk flows and sounds a lot better.
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Old 02-24-2023, 10:25 AM
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Quote:
Originally Posted by Steve W View Post
The Dansk flows and sounds a lot better.
Quick question, Steve (and apologies for the minor thread-jack). Do you have any experience with the Dansk 1-in-1-out? Does that flow better than stock as well?
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Old 02-24-2023, 10:43 AM
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Quote:
Originally Posted by ejp View Post
Quick question, Steve (and apologies for the minor thread-jack). Do you have any experience with the Dansk 1-in-1-out? Does that flow better than stock as well?
I had the 84mm Dansk Sport 1 in / 1 out on my 1988, that Steve dyno tuned. I didn't do a before / after comparison with the stock muffler, but that car tuned well and felt very strong (55k on the motor and Web 20/21 cams).

FWIW, this 2 in / 1 out 60mm Dansk Sport sounds good. It's mellow. I can hear the engine's unique air-cooledness again and it has the deeper exhaust note I was looking for at WOT above ~4.5K RPMs. It augments the motor's sounds, including induction (open airbox cover) without drowning them out.

It's been a while since I lived with the 84mm 1 in / 1 out Sport, but it's still one of my favorites (albeit, the tip size can be a bit much). If I recall it correctly, it may be a bit more aggressive than this 60mm 2 in / 1 out. But... some time has passed now, and I had the 1/1 on different cars, etc.
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911 M491 / M470 coupes:
1987 GP Wht / Blk "Apollo"
1987 Gemini Blue / Blk "Gemini"
1989 GP Wht / Blk "Vents"
Old 02-24-2023, 10:56 AM
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The factory stock 1 in 1 out muffler is only a 7 hp restriction compared to no muffler at all, which is of course not practical for a street car. Any decent sport muffler that attenuates an open exhaust down low enough for street use or a db limited track such as Laguna Seca is going to cost about 4 hp. There are sport mufflers out there that cost more power and flow less than the stock muffler, of which will remain unnamed here. The Dansk 1 in -1 out sport muffler is about a 2 hp improvement over stock, the 2 out about 3 hp, while being quite a bit louder.
Old 02-24-2023, 11:08 AM
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One other comment about the Scart I posted above…as nice as it sounds from outside the car, I love it even more from inside the cabin. Also it’s really pleasant when just cruising or taking it easy. No problems having a conversation and no unpleasant drone. But poke the bear and it lets you know it’s there and you tend to not want to let up.
Old 02-24-2023, 04:26 PM
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SCART goodies as seen in the Stoddard booth at the Lit Show.

Of particular note is the three piece steel, center exit, valance. Pretty slick setup.

Stoddard will be carrying the full SCART line soon.

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Frank Amoroso
911 M491 / M470 coupes:
1987 GP Wht / Blk "Apollo"
1987 Gemini Blue / Blk "Gemini"
1989 GP Wht / Blk "Vents"
Old 02-25-2023, 05:24 PM
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Love that revised valance - are you fitting this to your car Frank?

I agree with Bill's post on cam timing and SSI diameter.

But what about the 41mm SSI kit from Dansk? it also allows the buyer to keep the existing 3.2 heat system.

I think the part number is 91.932S41

Old 01-17-2025, 08:00 PM
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I’m really intrigued by this new SSI offering - the bigger 41mm primaries, then also bigger 60mm secondaries (usually only 50mm) straight into a muffler with the bigger 60mm inlets. I’ve have not heard of anyone running this new unit yet though. It also can be had with dual cats before the muffler and with dual out muffler options.





https://www.heritagepartscentre.com/us/pc1110134-ssi-exhaust-kit-with-41mm-heat-exchangers.html
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Old 01-18-2025, 05:13 AM
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Quote:
Originally Posted by stephen1070 View Post
Love that revised valance - are you fitting this to your car Frank?

I agree with Bill's post on cam timing and SSI diameter.

But what about the 41mm SSI kit from Dansk? it also allows the buyer to keep the existing 3.2 heat system.

I think the part number is 91.932S41
Yes, that rear valance will go in my '89 build. I will try both a Ti GT3 RS muffler with valved secondaries and the Scart GT3 tip muffler with non-valved secondaries.

That being said, I've since tried three different 2 in / 1 out mufflers on my blue '87 since my last post on this thread.

1) A Scart Riva (which is louder than their Sport)...
https://youtu.be/RpIgU2jTpWI
Ends up that it was too loud for my Club Sport-ish / mildly wife unfriendly use case (especially for 6:30a Saturday/ Sunday departures in my suburban neighborhood).

2) Monty 2 in / 1 out. Sounded better, but not as good as the 1 in / 1 out Monty on my other '87 with stock 3.2, but that's and apples vs watermelons comparison.

3) The Scart Sport (mellower than Riva) that I've currently settled on. It's more aggressive than stock, but just a bit less aggression than I was looking (listening) for.

I have a muffler problem tho, so we'll see how long before I try something new, or swap one of the others back in...








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Frank Amoroso
911 M491 / M470 coupes:
1987 GP Wht / Blk "Apollo"
1987 Gemini Blue / Blk "Gemini"
1989 GP Wht / Blk "Vents"
Old 01-19-2025, 08:10 AM
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I am struggling to get a nice muffler for my 3.6conversion. Watching this thread with interest. My car is coming out of massive rust repair and body work. Right now I have Rothsport headers and a GT3 muffler. Sounds amazing…..valves closed or open…..but too loud for conversations or a cell phone. My 3.2 have a full Fabspeed system with one outlet. Had been thinking about a Fabspeed 2 in-2 out muffler for my 3.6, and valve one of the tips so it;s 2 in/1 out below 4,500RPM. Reading this thread…..maybe I need a one of the gT3 style mufflers talked about here. Hmmm.
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2001 996 Turbo - ~54k miles
Old 01-19-2025, 12:10 PM
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Quote:
Originally Posted by Duc Hunter View Post
I am struggling to get a nice muffler for my 3.6conversion. Watching this thread with interest. My car is coming out of massive rust repair and body work. Right now I have Rothsport headers and a GT3 muffler. Sounds amazing…..valves closed or open…..but too loud for conversations or a cell phone. My 3.2 have a full Fabspeed system with one outlet. Had been thinking about a Fabspeed 2 in-2 out muffler for my 3.6, and valve one of the tips so it;s 2 in/1 out below 4,500RPM. Reading this thread…..maybe I need a one of the gT3 style mufflers talked about here. Hmmm.
I put a Fabspeed RSR on mine a few years ago, they sound great, no high frequency stuff, just mellow basso, and you can even hear the engine cooling fan
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Old 01-19-2025, 12:31 PM
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I put a Fabspeed RSR on mine a few years ago, they sound great, no high frequency stuff, just mellow basso, and you can even hear the engine cooling fan
Oh look folks….The Great Bill V to the rescue….AGAIN!

Bill thanks for the suggestion/support. I just wish they weren’t so much $$. I’m hunting a used one.

My other idea is to cut the current SS 997 GT3 muffler I have apart, and pack the quiet outer chambers with SS packing to quiet it down a bit. Not sure I could then weld the panel back on…still it’s an idea. It does fit perfectly with my Rothsport headers, which I were designed to fit it leveraging the dual inputs and valves. Plus I have a set of 917’esq on the GT3 muffler.
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1975 911s Insta: @911ratrod steel wide body, 3.6 conversion
1989 911 Carrera 25th Anniversary Ed (5th from the last car to ever leave the original Porsche factory assembly line)
2001 996 Turbo - ~54k miles
Old 01-19-2025, 04:47 PM
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I have a Monty 2 in 2 out and a Dansk 2 in 2 out both for 74 to 89 for sale in the parts section.
Old 01-19-2025, 04:52 PM
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Quote:
Originally Posted by Duc Hunter View Post
Oh look folks….The Great Bill V to the rescue….AGAIN!

Bill thanks for the suggestion/support. I just wish they weren’t so much $$. I’m hunting a used one.

My other idea is to cut the current SS 997 GT3 muffler I have apart, and pack the quiet outer chambers with SS packing to quiet it down a bit. Not sure I could then weld the panel back on…still it’s an idea. It does fit perfectly with my Rothsport headers, which I were designed to fit it leveraging the dual inputs and valves. Plus I have a set of 917’esq on the GT3 muffler.
I tried ta GT3RS muffler for a while, sound was ok, not annoying to me, just didn't want to redo the rear of the car.

A buddy has a 4.0 Rothsport, very nice, again noise sn't an issue w/ it


packing the space between the screens ought to quite the quite inlet a lot more

Burns has some nice packing too


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Old 01-20-2025, 06:31 AM
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