ANNOYING EXHAUST SOUND
- Thread starter CFD244
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Flowmaster resonators worked for me.
Swinger 340
Well-Known Member
I think you may be hearing the exhaust bonusing off the road. My van has duel 2.5" exhaust coming out in front of the rear tires and if I'm passing someone or in a tunnel (yes, we have a tunnel in Ft. Lauderdale), the sound is amplified. In your case, as your speed increases, the sound is left behind you, so others can enjoy your music.
Swinger 340
Well-Known Member
The Walkers is what I have been using for 50 years, and they have a soft sound, but deep rumble at idle or low speeds, but will open up when the pedal is touching the metal.
Kendog 170
Let the boy go !
I've noted these two mufflers from previous posts that are quiet. I still may buy one of these.
Walker 18113 has the same dimensional case length of an OE v8 A body Muffler and is 2 1/4" in and out.
AP Exhaust 6519 Muffler $50
AP Exhaust 6519 Xlerator Performance Aluminized Steel Oval Exhaust Muffler | eBay
WALKER EXHST 18113 Universal Tru-Fit Muffler | eBay
Walker 18113 has the same dimensional case length of an OE v8 A body Muffler and is 2 1/4" in and out.
AP Exhaust 6519 Muffler $50
AP Exhaust 6519 Xlerator Performance Aluminized Steel Oval Exhaust Muffler | eBay
WALKER EXHST 18113 Universal Tru-Fit Muffler | eBay
Woody500
Well-Known Member
Google Helmholz exhaust & you'll see them for sale. Most need mounted next to mufflers.
I've wondered if resonators mounted after the mufflers next to leaf springs might also work(if enough room) may be easiest cheapest fix. Some are stuffed with Steel Wool instead of fibreglas & last longer.
Anyone tried that? Or a set of cherry bomb type mufflers, again with Streel Wool.
OVERVIEW
Flowmaster's universal resonator helps avoid interior drone with an innovative product designed by Flowmaster's advanced R & D lab. Featuring a 2.50 inch offset inlet, 2.50 inch same side offset outlet, it delivers sound control on tough to quiet applications unlike anything else on the market. Flowmaster's universal resonator can be installed in front of or behind the muffler in new or existing installations and will work with other muffler types beyond Flowmaster. These amazing resonators feature full 409S stainless construction and are backed by our limited lifetime warranty. Best of all, they contain no packing materials so the tone achieved on initial start up, is the tone for life. These resonators have proven to be very effective when installed in the tailpipes behind the mufflers in dual muscle car applications, but can also be used in smaller displacement truck and SUV applications.
Features:
- Universal
- Reduces interior resonance
- Universal inline resonator 2.50 in. inlet and outlet
- Durable fully welded 409 stainless steel
abodyjoe
Well-Known Member
i have a set of those not sure on the part number though) and they are horrible with the drone.
Kendog 170
Let the boy go !
Which one" AP or Walker? Thanks. I only heard a few videos on my quest for quieter mufflers. I'm on my 3rd set!
Dave999
Well-Known Member
standing wave in the exhaust
anything you can do to alter the length before the muffler will alter the RPM it drones at, for better or worse, trial and error really.
resonator achieves the same because its basically a muffler with no muffle, as it were.
its there to disrupt the standing wave so the droney-ness is reduced at the rpm you heard it at but hopefully its moved to an rpm where you don't care.
anything you can do to alter the length before the muffler will alter the RPM it drones at, for better or worse, trial and error really.
resonator achieves the same because its basically a muffler with no muffle, as it were.
its there to disrupt the standing wave so the droney-ness is reduced at the rpm you heard it at but hopefully its moved to an rpm where you don't care.
What about a resonator in the tailpipes? I really have no room in front of the muffler because the system is nicely tucked up high.
abodyjoe
Well-Known Member
the ap that i have on the car now.
MOPAROFFICIAL
If it has tits, it's a liabilititty.
Never liked borla exhaust, try dynomax ultraflos
jos51700
Green Bearing thread connoisseur
I've wondered if a small muffler at the end of a piece of pipe T'd into the exhaust might help. Dead end, no exit. Or something like a muffler in an H pipe after the mufflers, fed from each side.
Yes!!!!
Dave999
Well-Known Member
you could use one there anything that alters the reflections of pulses in the system can change the situation.. but as i say could be for better or worse.
there are complicated equations that can be used to establish wave behaviour of a gas in an open pipe of differing diameters, so in theory you could design a system around a set of parameters that made sure that you didn't drone at common speed limit speeds.
but hey that's gonna be degree level hard work, i.e a bit more complicated than working out the length and bore of the organ pipe for middle C on a church organ, in comparison to a pipe for low C.
Which i think is as far as i got at school,before my brain fried.
solid theory but hard work when the pump is changing speed the volume of gas is changing and its being pulsed by a valve of diameter X into a pipe that combines with 2 or 3 or 4 others of diameter Y into a pipe of diameter Z at a distance of 3 foot from the valve etc etc for the full length of the system.
Dave
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Icetech
Well-Known Member
I was picking my third set of mufflers yesterday and watching videos.. the borlas (xs pros) sounded bad all around to me and i found others complaining of drone.. I ended up ordering Hooker Max Flows.. i found a chart of like 15 mufflers with db's at idle/2000/wot and the hookers had the lowest at idle/cruise.. which is good for me.
Cant' wait to throw away these last mufflers
Cant' wait to throw away these last mufflers
VOETOM
Well-Known Member
Max Flows are similar to UltraFlos and will be decent mufflers. The longer the better.
Not that this is the way to do it but a guy I know would buy mufflers from local stores and slip them on with band clamps, test out the sound, and take them back if he didn't like what he heard.
Who wants mufflers on their Mopar that makes it sound like a late model Mustang. 
Icetech
Well-Known Member
Not that this is the way to do it but a guy I know would buy mufflers from local stores and slip them on with band clamps, test out the sound, and take them back if he didn't like what he heard.
yeah... i love the sound of the max flows in videos.. and mine being 3" will be a bit louder than the 2.5s i hear but should be ok...Those Summit "Turbo" mufflers i got really screwed me... ended up costing $2k chasing issues...
Nice sound. They sound great when he get's with the program but a nice mellow tone when just cruising. Drone at a certain rpm can be annoying.
Icetech
Well-Known Member
yeah... my car is usually around 2800-3000 which should be out of drone range...
MUFFLER DECIBEL LEVEL RESULTS
1) Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2) Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3) Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4) Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5) Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6) Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7) Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8) Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9) Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10) Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11) Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12) Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13) Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14) SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15) MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16) No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db)."
I put Dynomax Super Turbos on my Swinger but it's just a stock 318 2 barrel with some home made dual exhaust. The old mufflers were rotted and these were the right size and available at a local Farm store. They are pretty quiet at idle. .
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