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| | | General muffler/exhaust question... | Joined: Jan 2012 Posts: 201 enthusiast | OP enthusiast Joined: Jan 2012 Posts: 201 | 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 360 - 600cfm edelbrock carb + intake Sensa-Track front shocks New coil springs Sensa-Track, load adjuster rear shocks Firestone airsprings 3core rad tranny cooler helman h4 low beam//Sylvannia nighthawk highbeam Mint interior (original floral velvet seating) Queen size upper birth 2 burner stove + oven 3 way fridge 16000btu/h furnace -carries - Yamaha Vino 50cc Scooter 9.5ft Mainstream Sound kayak Sportrack Luggage box ====Shows===== 1st place - furthest from home - Super Somer 12 (2100+miles) ========== www.my-time-my-way.blogspot.com | | | Re: General muffler/exhaust question... | Joined: Sep 2009 Posts: 868 Likes: 2 old hand | old hand Joined: Sep 2009 Posts: 868 Likes: 2 | 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!
1972 Dodge Van "Tigerlilly" - Blazing Copper/Sandstone Metallic - 3850 lbs empty 13.47 @ 97.53 mph N/A - 11.94 @ 113.33 mph N2O - old 360/727 + Nitrous (N2O)combo Viper V10 + 4L80E conversion in progress...
2009 Dodge Challenger SRT8 "Leelu" - TorRed - 6.1L Hemi/6 speed - Supercharged - SOLD
1990 Celica Alltrac "Emma" - 2.0L 4cyl Turbo AWD - 327awhp - 21-22mpg freeway, 17-ish mixed daily use - 13.2 @ 108 best so far.
2007 Chrysler 300C SRT8 "Ruby Rod" - 6.1L Hemi - pretty much bone stock driver - With 425hp
| | | Re: General muffler/exhaust question... | Joined: Aug 2005 Posts: 21,211 Likes: 25 Supreme Master | Supreme Master Joined: Aug 2005 Posts: 21,211 Likes: 25 | 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... | Joined: Jan 2012 Posts: 91 journeyman | journeyman Joined: Jan 2012 Posts: 91 | How much should you pay for some like that?...I'm considering that on my 94 as well. | | | Re: General muffler/exhaust question... | Joined: Jul 2012 Posts: 36 newbie | newbie Joined: Jul 2012 Posts: 36 | 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. | | | Re: General muffler/exhaust question... | Joined: May 2006 Posts: 4,460 pooh-bah | pooh-bah Joined: May 2006 Posts: 4,460 | 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.
2003 Grand Caravan Member Vanatics Van Club-Spfld, IL Member Florida Van Council Member Central Florida Vans,-Orlando, FL | | | Re: General muffler/exhaust question... | Joined: Feb 2009 Posts: 247 enthusiast | enthusiast Joined: Feb 2009 Posts: 247 | 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. | | | Re: General muffler/exhaust question... | Joined: Feb 2010 Posts: 1,215 old hand | old hand Joined: Feb 2010 Posts: 1,215 | 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... | Joined: Aug 2001 Posts: 12,107 Likes: 37 Maniac | Maniac Joined: Aug 2001 Posts: 12,107 Likes: 37 | 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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