Stoddard's new muffler
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Stoddard's new muffler
Anyone have any experience with Stoddard's new stainless muffler that was designed by Magnaflow? All information would be appreciated as I am contemplating purchase.
Thanx
Jerry
Thanx
Jerry
- Neil Bardsley
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Re: Stoddard's new muffler
I saw a video that PRS posted on youtube of a Magnaflow exhaust on a 356 they had worked on. Contact Mike Smith on here or Paul Smith at the shop
- C J Murray
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Re: Stoddard's new muffler
That must have been the car with an engine I built a few years ago. They tried the system but decided to remove it for reasons best explained by them since I don't know the details. On the other hand we have a regular poster here who has one on his car and he may wish to chime in.neilbardsley wrote:I saw a video that PRS posted on youtube of a Magnaflow exhaust on a 356 they had worked on. Contact Mike Smith on here or Paul Smith at the shop
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Re: Stoddard's new muffler
I watched the video. Is it safe for the cameraman to balance himself on the engine lid? I was shocked to see oil spots on the PRS driveway!
https://www.youtube.com/watch?v=fbxj3mfMsxE
https://www.youtube.com/watch?v=fbxj3mfMsxE
'57 Speedster
'59 Sunroof
'60 Devin D Porsche Race Car
'63 Cabriolet "Norm"
'67 911 S Original Owner
'03 Ferrari 575M
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Re: Stoddard's new muffler
Anyway, this was a perfect opportunity to do back-to-back chassis dyno runs to compare/contrast two the two mufflers, which is displayed nearby. The BLUE trace is the Stoddard/Magnaflow muffler and the RED trace is the GDP. The engine is a stock S90 with approximately 45000 miles since it was rebuilt. There is a dip in torque through the mid-range which is not noticeable in my real world driving, but we intend to try additional development next year to see if that dip can be mitigated.
Jeff
< Jeff >
Registry Member Since 1978
1963 356B T-6 Super 90 Coupe
2009 997.2 Carrera S
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Registry Member Since 1978
1963 356B T-6 Super 90 Coupe
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2015 958 Cayenne diesel-1 & 2015 958 Cayenne diesel-2
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Re: Stoddard's new muffler
Well, the figures speak for themselves! Down on torque in that vital mid rev range from 2500 -4000rpm where most of us spend a lot of time!
Jay
Jay
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Re: Stoddard's new muffler
but fast enough to blow luggage off the back of the car?Jeffrey Leeds wrote:I have the Stoddard/Magnaflow muffler which I installed July 29, 2018. This muffler replaced a GDP Twin Tip muffler that had been in service for 3 years with a good experience. The reason for the change was to try something new and more importantly to return my car to it's previous configuration where the exhaust outlets exited through the rear valance openings, rather than under the valance as does the GDP TT. When my car was restored by Bob Grigsby in the early 90's he left the front and rear bumper over-riders off preferring a more "continental" look, which I also prefer.
Anyway, this was a perfect opportunity to do back-to-back chassis dyno runs to compare/contrast two the two mufflers, which is displayed nearby. The BLUE trace is the Stoddard/Magnaflow muffler and the RED trace is the GDP. The engine is a stock S90 with approximately 45000 miles since it was rebuilt. There is a dip in torque through the mid-range which is not noticeable in my real world driving, but we intend to try additional development next year to see if that dip can be mitigated.
Jeff
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Re: Stoddard's new muffler
For Sure !
< Jeff >
Registry Member Since 1978
1963 356B T-6 Super 90 Coupe
2009 997.2 Carrera S
2015 958 Cayenne diesel-1 & 2015 958 Cayenne diesel-2
Registry Member Since 1978
1963 356B T-6 Super 90 Coupe
2009 997.2 Carrera S
2015 958 Cayenne diesel-1 & 2015 958 Cayenne diesel-2
- Gary Cox
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Re: Stoddard's new muffler
Curious if the curves shown is an average of several dyno runs for each muffler or just a single run for each? The dip might be mitigated by simple statistical analysis....
Gary Cox
Baton Rouge, LA
1958 356A Speedster
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Baton Rouge, LA
1958 356A Speedster
1967 912 (356D)
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Re: Stoddard's new muffler
Each muffler had two runs and the best run of each muffler is displayed.
< Jeff >
Registry Member Since 1978
1963 356B T-6 Super 90 Coupe
2009 997.2 Carrera S
2015 958 Cayenne diesel-1 & 2015 958 Cayenne diesel-2
Registry Member Since 1978
1963 356B T-6 Super 90 Coupe
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2015 958 Cayenne diesel-1 & 2015 958 Cayenne diesel-2
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Re: Stoddard's new muffler
You can infer the Y-scale values from the max power numbers, so the best showed what looks like 3HP gain (say a bit over 5%) for a limited range. It's not nothing, but it would take a very finely-tuned butt to notice the difference in use.Jeffrey Leeds wrote:Each muffler had two runs and the best run of each muffler is displayed.
It'd be nice to see the other runs and the torque curves.
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
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Re: Stoddard's new muffler
Yeah, but it's so hard to find someone who knows how to tune butts these days, I think it is truly becoming a lost art...Ron LaDow wrote:You can infer the Y-scale values from the max power numbers, so the best showed what looks like 3HP gain (say a bit over 5%) for a limited range. It's not nothing, but it would take a very finely-tuned butt to notice the difference in use.Jeffrey Leeds wrote:Each muffler had two runs and the best run of each muffler is displayed.
It'd be nice to see the other runs and the torque curves.
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Check out my Barn Find column in the Registry magazine, always looking for good stories.
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Re: Stoddard's new muffler
Does the GDP muffler equal the OE design for torque/power?
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Re: Stoddard's new muffler
Does the Stoddard muffler clear the Pre Mat FullFlow filter?
- DonCichocki
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Re: Stoddard's new muffler
Yes. '65 C stock exhaust with Pre Mat full flow adapter.
Sorry, I must correct my post.
The stock Dansk muffler clears no problem. No clue about Stoddard's "new muffler".
Sorry, I must correct my post.
The stock Dansk muffler clears no problem. No clue about Stoddard's "new muffler".