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Old 02-21-2009, 11:02 AM
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an interesting exhaust idea...

I am currently building a 1980 Plymouth Arrow Truck (same as a D50) the truck has a 302 in it and was a runner running 40 series flowmasters, I love the sound of my exhaust however I have been considering an interesting option. I have been thinking about running these guys http://www.jegs.com/i/Mr.+Gasket/720/5424/10002/-1 on the turn downs off my flowmasters then running the exhaust from the cut out to an extremely quiet muffler. So the cut out would allow me to select between my loud flowmaster exhaust or the super quiet muffler. My flows dump just before the axle so there is plenty of room for another exhaust system (true dual exhaust) I think this could make for a pretty cool sleeper setup and would be nice on longer road trips to be able to flip over to a nice quiet exhaust. What do you guys think?

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Old 02-21-2009, 11:34 AM
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i have never seen in person or used those, so i dont know how well they operate, plus at 2", its realativly small for most people.

I am a big fan of the dual sound exhaust that your trying to do. My '85 D150 fullsize Ram currently has such a system. It consists of a 2.5" y-pipe into a 3" main pipe with a full 3" flow path glass pack with a cutout behind it before the rear wheels. Then it goes into a stock type muffler and a 2.25" stock tailpipe out the back. My cutout is a manual type with a block off plate, but in the future i hope to get an electric version.

With just the glass pack its a little loud for my taste, but does sound good, and with it corked up, its nice and quiet.

I have also done another type of system when i had my '73 Dartsport. I had a 3" y-pipe into a full 4" single system out the back---but at the end turndown, i built a cable operated flap and right above the turndown i had a shorter smaller 2.5" piece that actually stuck out from the bumper. Obviously with a 4" system i had a motor with some bite to it but amazing when switched to that little 2.5" spout how it would cut down the sound.

Also, i am a big fan of single exhaust sytems although sometimes trying to fit bigger pipe is a pain. i make my own systems from straight and mandrel bent curves. I have never found a shop around here the would do nice mandrel bent pipe, so i just make my own---really no different than building a set of headers.
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Old 02-21-2009, 11:49 AM
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I have considered building my own cut out because of the available sizes, that link was more reference than anything. I don't really want to go the manual route I would much rather be able to "shift on the fly" but dang the electric guys are SPENDY
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Old 02-21-2009, 12:04 PM
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I agree, the electric ones ARE spendy, i too have been thinking of doing another manual home built one again. I just havent had the time. I use the standard cutout that has the block off plate and wing nuts currently, so adding an electric on it is super easy to do.

Look into an exhaust sizing chart to get the correct size for your application also. Most guys running 2.5 and 3" duals only really need a 2 or 2.25" dual system, or a nice single 3" system. I dont know what your 302 is going to be built for, but if you can snake a 3" single system through there, that might be the way to go.
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Old 02-21-2009, 12:07 PM
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Would be extremely difficult given the amount of room I have under the truck, this project is actually a little ways out I still have to build a set of headers for the truck. That is going to be interesting, first set of headers I have built.
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Old 02-21-2009, 12:14 PM
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Engine Size Horsepower Muffler Inlet / Outlet Size

....................................Single Exhaust------ Dual Exhaust

150-200 CID 100 to 150 2" to 2-1/4" ..............2"
200-250 CID 100 to 200 2-1/4" to 2-1/2".....2" to 2-1/4"
250-300 CID 150 to 250 2-1/2" to 3" ...........2" to 2-1/2"
300-350 CID 200 to 350 2-1/2" to 3"...........2-1/4" to 2-1/2"
350-400 CID 250 to 550 3" to 4"..................2-1/2" to 3"

Use as a general guide for engine size and performance.

Last edited by 383ram; 02-21-2009 at 12:20 PM.
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Old 02-21-2009, 12:18 PM
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go back and study the Jeg's pick,,,,
you run the "manual choke" cable/knob upto the dash,,,
just pull/push for open/closed while driving,,,
it's just a chimney "damper" flapper

(same unit has been around since the 50's when we used them for full length "lakes pipes" open exhaust along the rockers)
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Old 02-21-2009, 10:44 PM
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"DUAL" exhaust.

Why not just run the tail pipes out to the back or behind the rear tires enough, and just put diffuser type Super Traps on the ends? Pull the disks out when you want it loud, put them back for in town. I know, it involves a little extra work, and is not as easy as pulling a cable. Besides, those splitters are cast iron, you'd have to braze them as they would'nt weld too well. What's the bumper sticker say; "If you think it's too loud, you're too old".
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Old 02-22-2009, 12:15 AM
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I think I am gonna save my pennies and go with the electric cut outs, I like the idea of being able to change on the fly. You can weld cast iron to steel, it's ugly but it can be done.
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Old 02-22-2009, 05:35 AM
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Quote:
Originally Posted by maxxheadroom
I think I am gonna save my pennies and go with the electric cut outs, I like the idea of being able to change on the fly.
I agree, that is definatly the way to go IMO.
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Old 02-22-2009, 05:50 AM
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Quote:
Originally Posted by maxxheadroom
I am currently building a 1980 Plymouth Arrow Truck (same as a D50) the truck has a 302 in it and was a runner running 40 series flowmasters, I love the sound of my exhaust however I have been considering an interesting option. I have been thinking about running these guys http://www.jegs.com/i/Mr.+Gasket/720/5424/10002/-1 on the turn downs off my flowmasters then running the exhaust from the cut out to an extremely quiet muffler. So the cut out would allow me to select between my loud flowmaster exhaust or the super quiet muffler. My flows dump just before the axle so there is plenty of room for another exhaust system (true dual exhaust) I think this could make for a pretty cool sleeper setup and would be nice on longer road trips to be able to flip over to a nice quiet exhaust. What do you guys think?
try it everything starts with an idea
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