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General muffler/exhaust question...
#550235 March 21st 2012 7:11 pm
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While going through all these motions I have noticed that my muffler is looking like it's about to explode...and chinked out and flexed.

I was wondering about running duals back from the stock manifold.

Questions...
1. what size is right? Someone said 2.5's were the best.
2. What type of muffler gives the best subtle sound and quality performance. Because I am using it for travel and camping I don't really want rumbling flowmasters but some aggression would be good.
3. I have an underbelly propane tank so running a pipe down the passengers side isn't an option (I don't think). Can I have both pipes dump in front of the driver side rear? Or behind. But..together?

Thoughts? He quoted me 350 aprox...not sure if that is a good price or not. (haven't shopped it around)




1982 Dodge B250 Okanagan Camper Van
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Re: General muffler/exhaust question...
honkytime #550585 March 22nd 2012 8:38 pm
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For a mostly stock 360 engine I'd go 2.25" exhaust. 2.5" is freer flowing, but not necessary for the small backpressure difference to 2.25. Smaller pipes will be a little quieter too and still give you plenty of giddy up and a nice tone. Largest length free flowing muffler you can get under there would also help keep her quieter but still, being a free flowing type (Magnaflow, Flowmaster, Dynomax Ultra-Flo, etc.) will make it noticeably louder than stock. GOod luck!


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Re: General muffler/exhaust question...
honkytime #550703 March 23rd 2012 6:44 am
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It cost me about the same to have true duals put on my 85 and the shop I used did a fabulous job. I think my pipes are 2" but I'm running a 318/2bbl.


Nate Breece
Re: General muffler/exhaust question...
NateB #551541 March 26th 2012 9:36 am
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How much should you pay for some like that?...I'm considering that on my 94 as well.

Re: General muffler/exhaust question...
PR1 #573363 July 10th 2012 2:05 am
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Pretty much any auto has the exhaust plugged up from the factory due to people driving them and not keeping them in tune.

Any free flowing of the exhaust is going to help in performance as its kind of like taking the plug out of the exhaust. So re leaving any back pressure due to multiple chambered mufflers will help. 2 1/4 to 2 1/2 would do the trick.
Get Aluminum pipe and pay the extra cost or you will be back to the exhaust shop before you know it.


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Re: General muffler/exhaust question...
honkytime #573367 July 10th 2012 3:15 am
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for a stock motor i would do a 2 1/4 true dual, too much bigger and you lose too much back pressure, which means you lose off the line grunt(torque). a good 1 in 2 out Flowmaster 50 or 70 series would keep it reasonably quiet, and still sound good. You can have your exhaust man run both pipes down one side then split them over the axle. I recommend side dumps or rear corner dumps on an older van because you will get a back flow of exhaust gas in the back doors if the seals are bad or you have pop out windows.


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Re: General muffler/exhaust question...
honkytime #573555 July 11th 2012 7:18 am
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I recommend 2 1/4" pipe from engine to mufflers, 2 1/2" pipe from mufflers to exhaust tips. Your exhaust will stay cooler during long hill climbs without killing torque.


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Re: General muffler/exhaust question...
honkytime #573870 July 13th 2012 1:03 pm
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Yea, I want to change the exhaust. Some dude cut the Y pipe off and put in 3" pipes and Flowmasters without running to the back.

Anyone know the diameters of the original Y pipe on a '77 B200 318 engine, 109" w.b.?

I was thinking about running 2 1/4" with some cheap turbo mufflers and have them exit at the back sides. Gas tank might be in the way, though....

Re: General muffler/exhaust question...
honkytime #575512 July 23rd 2012 12:53 pm
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Walker quiet flow mufflers are great for quiet sound but free flowing, for a mild 318 with dual exhaust I would say 2 or 2.25 inch exhaust. Or, I say run a single 2.5 inch the whole way back. Same low restriction exhaust, less weight, no issues with running next to the propane tank on the passenger side.


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