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Joined: Feb 2019
Posts: 3,857
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Talk Morgan Addict
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Talk Morgan Addict
Joined: Feb 2019
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Originally Posted by High Noon
.........hold on not so fast!

I've recently been reading about all the aftermarket muffler systems to improve the M3W. I am impressed with the improved performance and engines running cooler. However, the total cost including crating and shipping to the US seems pretty pricey.

My friend, Grockle, told me right after he recently installed his Morgan Stage I kit that I would eventually want to improve mine. Then I went for a little cruise last week on a warm evening, and I noticed the fan was on almost immediately and continued running all the way home as well. Did you notice I said warm not a hot evening!

That really got me thinking, and I checked out Magnaflow's stainless steel muffler options. Many of the top end street rod, hot rod and high end performance auto manufactures use Magnaflow mufflers for the quality, performance and sound. But could I find one that would work on the M3W was the question.

After some research, I found one that would work. However, at 4" diameter, I knew it would have to be a precise fit to make it work. I had an old Summit Racing gift card from my wife, Linda, in my desk and they just happened to have a $25 discount if you spent $150 and free shipping for any order over $99! So I ordered two Magnaflow mufflers, two 48" polished stainless steel tubes and a small roll of stainless steel welding wire for my little Hobart welder. In all I have less than $300 in this M3W muffler upgrade.

Well, this evening after five days of on and off work, the project was finally completed. I was nervous starting the M3W this evening, but in just a few trial trips up and down our long driveway, I was just tickled pink! The Magnaflow's have the pleasant low tone groan but not too loud. The best news is the fan never came on until I was putting it in for the evening. So the M3W is definitely running cooler and sounds just right to my ears.

I tell people all the time in my writing, blogs and posts if I can do this anyone can, but Linda reminded me today to give myself more credit than that. I'm not looking for credit here, but you will need a few mechanical, engineering and welding skills to pull this off. Maybe you have a friend who could help or a welding shop nearby.

I now want to do a few road tests and a few videos and should have more to follow including a complete article soon. So please stay tuned!

They don't call them Magnaflow for nothing!

High Noon Speed Shop

My Blog: https://ontheroadtonowhereville.wordpress.com/

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The heart of the High Noon Magnaflow.


2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)

Joined: Dec 2017
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Talk Morgan Expert
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Talk Morgan Expert
Joined: Dec 2017
Posts: 2,221
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Stephen: Many thanks.


Bruce
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice) tis no more
2013 M3W (Olga)
Joined: Feb 2019
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Talk Morgan Addict
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Joined: Feb 2019
Posts: 3,857
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High Noon, are there any baffles in that Magnaflow?


2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)

Joined: Jan 2019
Posts: 17
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Posts: 17
I didnt put the cams in my engine, the previous owner had them installed. But wouldnt be afraid to do the job myself. I downloaded the service manuals for the engine and am confident enough to do it with the manual out. I will eventually swap out to a larger throtle body from S&S and put a big bore kit on it. 128ci sounds like the perfect mod.
About the exhaust build.
There are no baffles. It is a straight pipe. The muffle has stainless packing around the main tube that is mesh.

I had a friend do the stainless welding so it would look halfway decent. If I wanted black pipes I could have use steel and save money and been able to weld it myself. The way I did my pipes you dont need to bend the tubes. I made a series of cuts that go about 90% of the way thru the pipe about 1/4" , 6 mm apart. you then push the cut together and tack weld it in place at each cut. you effectivly put small pie cuts in the tube and get the desired curve. I thought about the second flex joint but elected to do this instead. I then had the cuts completely welded up for me. Its thin metal and I am not that good witht the tig welder yet. However, the welds are not really visable as the are under the heat guard. I probably could have just bought stainless wire for my mig welder and been fine on my own. But if you look thru the holes in the guard you see my crappy tack weld and Mitches beautiful stack of dimes. lol.
If you are curious about the Protune software you can download it and play with it to learn what you are doing and read their instructions. It is very user friendly.
It is free. It also has a demo map loaded in it that you can play with. I Heard it will plug into a stock ECU and let you look around but not change anything. On my ECU behind the bulkhead there is a small removalble cover that hides a micro USB plug. Hook it up and you are in business. Again not 100% if the stock has it. but I am prettty sure someone said it did in one of these threads.
Here is the link for the free download. https://www.sscycle.com/tech-info/software/protune-ii

Joined: Mar 2015
Posts: 902
Talk Morgan Regular
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Joined: Mar 2015
Posts: 902
Obie, hi. Do you have a part number for the flexible coupling?

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