1973 Dual Muffler Stock exhaust

videoguy009 · Posted: Mon Sep 01, 2014 11:34 am Post subject: 1973 Dual Muffler Stock exhaust

I have the divided header on my 73 thing.I was looking at buying the stock dual muffler system.I have a 1776 with a 110 cam.Will this new exhaust be more restrictive and will it be quieter than the divided header.
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1971 Super Beetle

quartermilecamel · Posted: Mon Sep 01, 2014 12:39 pm Post subject:

I would guess quieter than non stock but any pictures?
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videoguy009 · Posted: Mon Sep 01, 2014 1:02 pm Post subject:

You can see a pic at www.cip1.ca part no. C23-35181.There is one for each side.
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1971 Super Beetle

77kafer · Posted: Mon Sep 01, 2014 5:20 pm Post subject:

videoguy009 · Posted: Mon Sep 01, 2014 6:12 pm Post subject:

Kafer,Will this setup work ok as far as my original question.
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1971 Super Beetle

GI Joe · Posted: Mon Sep 01, 2014 7:46 pm Post subject:

Check pipe diameters, but I'd guess the stocker style is a bit smaller than the divided system... That Will restrict your 1776.... Not sure how bad, you may notice it, ya may not....

It will certainly be quieter... Wink

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videoguy009 · Posted: Mon Sep 01, 2014 7:55 pm Post subject:

I would give up a little top end for a little quietness.The pipe diameter is 1 3/8 on the divided and it looks the same on the duals.My ports on the motor are 35 intake and 40 exhaust.40 exhaust is approx. that diameter of the pipe.I should be okay with very little restriction.
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1971 Super Beetle

IHC · Posted: Mon Sep 01, 2014 8:33 pm Post subject:

The one at cip is for the 74 with heater boxes not the73. You can use it with j pipes on the 73.You can purchase the correct 73 exhaust from The Thing Shop.Go to their web site and look at the stock 73 exhaust.

randybriscoe · Posted: Mon Sep 01, 2014 8:46 pm Post subject:

Image may have been reduced in size. Click image to view fullscreen.

Top is the available OEM muffler, as of 2014. The one below is an original '73 muffler from my car. These are similar in concept to the WWII mufflers on the Type 82, designed for ground clearance/angle of departure. It's a credit to VW engineers that they were flexable enough to design body clearance for both. Also the HP ratings on the thing were the same as the sedan. But a well designed/tuned 4-in-to-one header will give you more power up top. I wonder if these don't increase cylinder head temp with there proximity to the valve covers?

randybriscoe · Posted: Mon Sep 01, 2014 8:50 pm Post subject:

Top is the available OEM muffler, as of 2014. The one below is an original '73 muffler from my car. These are similar in concept to the WWII mufflers on the Type 82, designed for ground clearance/angle of departure. It's a credit to VW engineers that they were flexable enough to design body clearance for both. Also the HP ratings on the thing were the same as the sedan. But a well designed/tuned 4-in-to-one header will give you more power up top. I wonder if these don't increase cylinder head temp with there proximity to the valve covers?

randybriscoe · Posted: Mon Sep 01, 2014 8:56 pm Post subject:

Wait, just noticed the 110 cam and the valve size...now I want to say something more. First a question, you have big valve heads? Any port work? Who's heads are those? And we need to know induction, what carbs? Is this an all the time street car? I got's to know.

quartermilecamel · Posted: Tue Sep 02, 2014 12:27 am Post subject:

wow just looked at the dual headers. I figured you had some aftermarket loud dual mufflers on there. Im honestly not sure if the single header muffler dual tip would be quieter or not.
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videoguy009 · Posted: Tue Sep 02, 2014 4:31 am Post subject:

As far as increasing head temp because of the location,nothing can be any closer than the divided header system.I am running an empi 40mm single carb with a 019 Mechanical distributor.There was no port work done and the heads are rb 042.For some reason the Thing Shop only shows the divided header system and no other mufflers.The part numbers I gave at CIP is the stock 73 without heater boxes.
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1971 Super Beetle

videoguy009 · Posted: Tue Sep 02, 2014 4:32 am Post subject:

Sorry forgot to add that this is a street car.
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1971 Super Beetle

doublecanister · Posted: Tue Sep 02, 2014 10:08 am Post subject: Air filter

Hey Videoguy009,

Just to note,

when I got my 73 with the stock style exhaust, it was LOUD,

after i started putting it back to more of a stock look, (in the form of a oil bath air filter), thats when I noticed it got quiet big time.

i know the exhaust will change the sound level but I was supprised that
going from a small chrome air filter to the stock style made as much difference as it did.

After a tune up it was even better, and I even researched a "quiet tire" to try to eliminate as much noise as possible, you couldnt even talk to your passenger without yelling it was so loud before.

now, you can talk fairly normal.

Just 2 cents if it will help, not sure what type of air filter intake system you have but a lot of engine noise does seem to come from there.

T
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2020 - Mustang Eco Boost [High Performance]
1973 - Thing
1966 - Mustang GT- Fastback
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videoguy009 · Posted: Tue Sep 02, 2014 11:07 am Post subject:

Thanks,I do agree as to how the air is handled coming into the carb. I had that experiment on my beetles.I have the stock empi 40mm idf carb so I am pretty well stuck to the air filter it came with.I spoke to German Motor Works,who own 6 Things and they said the stock 73 exhaust worked really well on his 1776 and that it was fairly quiet compared to the divided header system which is Chinese junk. It is simply two hollow cans.The German stock exhaust was engineered with internal baffles,Etc. Alot of people do not realize the divided header exhaust is made in China.
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1971 Super Beetle

citroen · Posted: Tue Sep 02, 2014 8:31 pm Post subject:

here is a picture of the inside of a stock 73 exhaust

after market 73 exhaust

stock 73 exhaust

videoguy009 · Posted: Wed Sep 03, 2014 5:54 pm Post subject:

How is the stock exhaust for valve adjustment?
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1971 Super Beetle

citroen · Posted: Wed Sep 03, 2014 8:19 pm Post subject:

Tight but you do not need to remove the exhaust. The stock exhaust will effect your power in a negative way you can not increase the valve size and the amount of fuel going in to the engine and not increase the size of the exhaust. Remember the exhaust pipe coming out of the stock exhaust is only 1 inch.

Jonny Rock · Posted: Thu Sep 04, 2014 6:50 am Post subject:

My stock replacement 73 exhaust doesn't seem to be too loud, but I am also running the stock oil bath cleaner.

I believe mine is the linked replacement kit, as my mufflers have a round, can type of exterior vs the originals with the two flat weld seams.

http://www.jbugs.com/product/181251053G.html?Category_Code=vw-thing-stock-exhausts

Adjusting the valves is still quite easy with this exhaust.


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