3.2 Magnaflow exhaust Video and construction

Thought would put this here from comments I had gotten in another thread. This is a street Magnaflow 3.2 exhaust I designed with some help from experience, two exhaust textbooks and FChatter GCalo; Here are some really crappy videos to give you an idea of the sound. It is much lower in tone, much smoother and quieter than most of the usual aftermarket suspects, but gets louder as the throttle is opened. I do not like the high pitched and harsh metallic tone of most all aftermarket mufflers, and this one does not have any of that. I like long trips in my car rather than short blasts, but when you open the throttle she does sing.

The construction is all stainless steel that is flat black ceramic coated, using two 2.25" dual in/dual out non-mixing Magnaflow mufflers with resonated tips. Entire assembly is about 15 - 20 pounds, so a bit of a weight saving.

The videos:
1. accelleration/decell. I've tried to show the tach. You can figure out what gear. Not quite like a V-12, but close
http://www.youtube.com/watch?v=dknY5U122o4

2. Cold start. At idle, the most noise you really hear is engine noise rather than exhaust noise.
http://www.youtube.com/watch?v=Vt11rkCJDrc

3. 70 mph cruise. A bit boring, but to show that it only gets louder as the throttle is opened, and that it's pretty quiet off throttle, mostly hearing road noise...
http://www.youtube.com/watch?v=ASoLbdHYPJo

Thanks also to James Patterson at Norwoods who built and installed - excellent fabricator!
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yes, the tips are the largest resonated resonated Ansa dual tips.
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Oh, and if it was not clear, 2.25" stainless tubing and mandrel bends were used throughout, then everything but the tips ceramic coated.

 

Sorry for late response; I have been away supporing the Parisian economy and getting lost around Gare D' Est. I found the folks incredibly pleasant, obtw. I even bought a beret.

I called Ansa in Georgia off of the website phone number. Tell them you want to talk about some Ansa parts for a Ferrari, then they will forward you probably to a guy named Paul, I think. I told him what I wanted ("...largest single or dual slash cut resonated exhaust tip like on a Ferrari Daytona, or the TurboKrome (TK) 5768"). He then looks at his list of national dealers and their inventory, tells me who has some and gives me a number to call.

Alternatively, Hooker Headers also makes a near identical resonated exhaust tip to the Ansa part. I would recommend this if the OEM Ansa unavailable, as I have heard the similar tips made by Monza are not built well.

This system is primarily designed for a 308/Mondial, 308/Mondial QV or Euro 3.2 exhaust system with the two exhaust feeds at either side of the muffler area and without the single cat that joins both header feeds.

Although a tad expensive, ceramic coating the entire exhaust system in flat black and leaving the chrome tips really looks and lasts much much better than paint.

I will also tell you that this system is a little difficult to build well (according to James at Norwood's - a terrific fabricator) so get someone good to make it.

Happy to help anyone with questions - we are all a team here.

rt

 

Sure -We're all in this together.

The Hooker resonated ends are even available from the Wal-mart of performance parts, Jegs; here is one of the sizes available:
http://www.jegs.com/i/Hooker/520/31407/10002/-1

Just to repeat, this is for if the Ansa is unavailable.
I would remove the Hooker name tape and replace it with red...

Heck, you can even order the muffler cans from there:
http://www.jegs.com/i/Magnaflow/642/11379/10002/-1#
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Yes, the old one was for the single outlet headers and this is for the dual Tubistyle headers.

The old one is still at Norwoods for sale CHEEP for you 3.2 US guys!

 

Yet another crappy video.

Although this may not add much to what you have heard before, it does show that it is not too loud at small openings, but as you progressively open the throttle, she starts singing more. Although dependant on your speakers/headset, the tone is actually quite lower than stock and the other aftermarket systems (except perhaps the Capristo) and is a lot smoother without the tinny modern F1 sound, but closer to a more classic Ferrari sound. (which was the idea).

http://www.youtube.com/watch?v=9TsxLSNeVdc

 

Thanks!

This came from studying the textbooks, some advice I had gotten, and looking at a lot (almost every) of classic Ferrari exhaust systems.

The theory here is called "dual resonance cancelling", and was even in the much older exhaust textbooks. To simplify, it's the proven fact that two mufflers of volume X are more effective than one muffler of volume 2X. You will see this used on the older cars. They are also more expensive to do and technically more difficult to construct in this installation than one muffler.

I also did a little experiment using the counterflowing but non-mixing absorbant mufflers based on the characteristics of the firing order of the Ferrari flat crank. The evenly spaced bank pressure waves were kept separate in the true dual system allowing optimum scavenge pulsing, but the sound wave peaks being perfectly interpolated each saw the entire volume of both mufflers without an overlapping peak, not "sharing" it with other sound peaks. This also allowed muffled sound from one side to fill in the 'valleys' of the other side giving a more constant, or smoother sound that you hear.

Of course, this could all be crap, and there is some degree of luck and magic in these things.

 

If we are talking about your Merak, that engine is a 90 degree V-6 developed from the Maserati V-8, so it will fire like a V-8 missing two cylinders. This is unlike the Dino V-6, which is a smooth firing 120 degree with even pulses. Here's a partial explanation:

You can see this on your distributor cap as it should look like a v-8 cap missing 2 connectors, i.e. 2 groups of 3; The Merak firing order is 162534, firing every 90 degrees with two spaces as it goes through the 720 degree rotation:
1-6-2-space-5-3-4-space

If you divide this by sides, you have:
1---------space-----2-------space----space----3--------space-----space
space-----6--------space----space----5--------space----4---------space

So the point I am trying to make, is that you can't even out the firing pulses by splitting or mixing sides. In this setting, I would also initially try the counterflow non mixing to fill in the sound peak holes to make it sound as smooth as possible.

 

In short,

It would sound deeper in tone - which is what the 2.25" magnaflows do; and a bit smoother - which is what the resonated tips do.

Good luck and let me know if I can help!