Curing Muffler Drone - what muffler choice?

[sam dupont]

I wonder about capped glass packs in place of the pipes

 

[33 IMP]

I didn't even know there was a calculator when I did mine. I just copied what someone else did and went with a fixed 28 inches. It might not be fully optimal, but I noticed a big reduction in drone. Either way you go, make sure you or your exhaust shop weld up both vertical hangers as well as horizontal connector tabs between these and the main exhaust. The first shop I had do mine only did one vertical hanger and in less than a year one side broke free and would rattle at certain RPM's. I didn't realize that's what it was for several years and that noise drove me crazy until I was under the car one day. My new exhaust guy secured it correctly and now I could do pull ups off of that thing.

I'm glad this topic is getting some interest because back when I did mine people thought I was nuts and looked at me like I was building an alien spacecraft. Science!

Others maybe. Not me!

 

[33 IMP]

I wonder about capped glass packs in place of the pipes

Might work really well. Expensive way to go compared to a couple lengths of exhaust tubing.
I wonder if the resonator tubing has to be as big as the system tube.

 

[RJ Squirrel]

One of my hotrods had a terrible harmonic at 1800 RPM, I took the back seat out and covered the area above the mufflers with Kilmat
sound deadening, made a dramatic difference.

 

[TorRed]

Of all the muscle cars I’ve heard (and a few I had) having a stock exhaust, the RR/GTX was the best sounding of all, MO. Buddy had a ’69 GTX back in the day that sounded sweet, nice tone, not obnoxious, but enough to make a statement.

I totally agree and from my experience the OEM exhaust tips have a lot to do with it, really shapes the sound.

 

[Black_Sheep]

One of my hotrods had a terrible harmonic at 1800 RPM, I took the back seat out and covered the area above the mufflers with Kilmat
sound deadening, made a dramatic difference.

I did the same and added some FatMat to the trunk divider panel and package tray for good measure. It all helps…

 

[Stroked438]

I have an exhaust shop at home, that i do custom stuff in. You can use a small glasspack muffler at the end of the pipe. I have used a 8 inch one on both sides and it does help more then just the pipes do. Im assuming the sound waves travel through the pipe and get canceled out inside the packing of the glasspack.

 

[1STMP]

I have a stock '73 340 RR with custom bent 2.5" exhaust with X pipe (still using stock cast exhaust manifolds). I am having trouble finding a muffler that suits my ears. I have tried the Dynomax VT - wonderful sound at idle and no drone, but just too loud on the highway when its running straight through. So, tried the Dynomax Super Turbo. Quieter for sure, but it droned at 1500/2500/3500 rpm - especially when coming off the throttle. So now I have Flowmaster Delta 50 mufflers on the car. When not droning, they are reasonably good sound level. However they hit massive resonance peaks at 1200/2000/3000 rpm, especially when decelerating. My old ears can't take these peaks and they occur around your typical cruising speeds.

The mufflers are located in the same location as stock, just ahead of the rear end. The Xpipe is located under the tail end of the auto trans.

Suggestions on what to try next? I would like to have some of the old school rumble, but if I have to go super quiet, that would at least make the car more pleasurable to drive. Maybe have to go back to a tube/baffle style muffler?

Thanks...

Allan

Late to the party, but I don't think you'd
be disappointed with Bassani. Rarely
thought of, and a very high quality.
I run them on a 5.0 Coyote and love
the low rumble. It don't sound like a
fart in a coffee can.

 

[Bird 426]

Quiet flow Walkers really cut the performance in my small block stroker. I like the sound of them, pretty quiet, I want to hear the engine and what it's doing, not the loud obnoxious noise that I hear every time I go to a car show from the supercharged you fill in the blank cars of today. I hate them, just as much as the fart can tuners.

 

[68 Sport Satellite]

Quiet flow Walkers really cut the performance in my small block stroker. I like the sound of them, pretty quiet, I want to hear the engine and what it's doing, not the loud obnoxious noise that I hear every time I go to a car show from the supercharged you fill in the blank cars of today. I hate them, just as much as the fart can tuners.

so you like the exhaust sound, but you can tell a seat of pants HP and torque reduction?

 

[Ron H]

My agree, was thinking of the fart burners, rice grinders with the huge ‘muffler’ sticking out. That’s a preference for some and no knocks on them. Like what ya like. MO, nothing like the sound of a V-8. Can’t be quite replicated in anything less. No expert, just opinion. As for sound or tone, the selection is endless, as are the personal preferences. I’ve had three types of mufflers on my current ride in the last 7-years. Being a geezer, my preference is quieter, especially when cruising, but makes plenty of sound when getting on it. Selecting mufflers for performance is another thing.

 

[Some Car Guy]

My agree, was thinking of the fart burners, rice grinders with the huge ‘muffler’ sticking out. That’s a preference for some and no knocks on them. Like what ya like. MO, nothing like the sound of a V-8. Can’t be quite replicated in anything less. No expert, just opinion. As for sound or tone, the selection is endless, as are the personal preferences. I’ve had three types of mufflers on my current ride in the last 7-years. Being a geezer, my preference is quieter, especially when cruising, but makes plenty of sound when getting on it. Selecting mufflers for performance is another thing.

What mufflers have you tried? I’m looking to quiet down my 440. Thinking a resonator is a must. Still not decided on the mufflers.

 

[Ron H]

What mufflers have you tried? I’m looking to quiet down my 440. Thinking a resonator is a must. Still not decided on the mufflers.

Had two sets of Flowmasters, last was the 50 series. Sounded sweet, but too loud cruising. Recommendations from fellow members lead me to Hemi mufflers, not cheap, actually a tidbit louder than I expected they might be, but quiet enough especially when cruising. They let you know they're there when getting on it, the way I like it.

 

[Some Car Guy]

Had two sets of Flowmasters, last was the 50 series. Sounded sweet, but too loud cruising. Recommendations from fellow members lead me to Hemi mufflers, not cheap, actually a tidbit louder than I expected they might be, but quiet enough especially when cruising. They let you know they're there when getting on it, the way I like it.

Would those be the accurate exhaust repops or some walker version? Thanks.

 

[Ron H]

Would those be the accurate exhaust repops or some walker version? Thanks.

Got them from Accurate

 

[dfrazz]

You can hear the hemi mufflers from Accurate during the first 30 seconds or so of this video of my Sport Satty (318 ci with full exhaust system from Accurate but still gives you a sample of what they sound like) -

 

[33 IMP]

For what it's worth, Jones exhaust makes some MONSTER mufflers, but also has some normal sized, in stainless, for pretty cheap prices. Available at summit, but they don't promote them
If you want good power, and quiet, I have a habit. Get the right size thru pipe, muffler included, and then get the biggest, longest, muffler that will fit under the car (Jones makes a 3" in/out, with a 36"long case!?!)

 

[Ron H]

You can bring up various videos to hear what rides sound like with various mufflers. Many suppliers have them. As you likely know, the same muffler can sound different on different cars, BB, SB, headers, etc. My car has headers so have a little bit of a hollow sound. Brought up various videos with Hemi mufflers and this one here is about the closest to what my ride sounds like.

 

[sam dupont]

What mufflers have you tried? I’m looking to quiet down my 440. Thinking a resonator is a must. Still not decided on the mufflers.

When in doubt about most anything, go with factory or close. They spend a lot of money to figure these things out. The Hemi muffler exists because they were solving a problem. Low back pressure and reasonably quiet so the Mopar Motörhead can get along with neighbors.

I like down turned tail pipes because they point the sound at the ground and can kick up leaves in the Fall

 

[Some Car Guy]

You can bring up various videos to hear what rides sound like with various mufflers. Many suppliers have them. As you likely know, the same muffler can sound different on different cars, BB, SB, headers, etc. My car has headers so have a little bit of a hollow sound. Brought up various videos with Hemi mufflers and this one here is about the closest to what my ride sounds like.

I’ve watched all the videos on accurate site. I felt they sounded on the loud side for some reason and oddly their tech guy seemed to discourage me from using the hemi resonators behind a 440. After looking at my list, I crossed them off due to extreme shipping costs, high costs for the mufflers, and since I’m doing new pipes the 2.25 outlets didn’t fit my plans. Really if I didn’t need new tailpipes I probably could stomach the costs and roll the dice on the smaller size.