Anyone have a set of DynoMax UltraFlo Welded mufflers on their Mopars
And How do you Like Them?
I have 40 series FloMasters on my 69RR, can not stand the
Drone sound you get from them

Got-em on my Bee and love em!

I have them on my race car with TTI headers and X-pipe ending at the rear end housing. After tuning with open headers for years, put these on, tuned a bit more and went faster!

I can hear my Holley blue pump at idle but got compliments at WOT.

Flow bastards suck! I like mine 3" X pipe dump before the axle only complaints I get at 10.6 is too quiet???

My dad has them on his 440 Coronet, with an H pipe, turned down after the axle. Sounds good, not too loud, no noticeable resonance.

Got a set on my f250, nice and mellow, and surprisingly quiet at idle and cruise, not obnoxious when I get on it. I would use them again, and again!

I have 3" Diameter ones with turn downs in front of the axle. Has a real nice sound at idle but really barks at full throttle. I love mine.

I've had the same set on two cars now. When I had them on my old Duster I used a "H" pipe. When they went on the 'Cuda I went with a "X". Both cars had very similar engines and TTI headers. The only difference was between "H" and "X" was the fact that the Duster had 2 1/4 tailpipes and the 'Cuda is 2 1/2 all the way through. No resonance with either setup. Personally I prefer the sound of the "X". Both engines made good torque, they had different transmissions [ 727 vs 5 speed manual ] and a few other differences so it's a little difficult to make an "apples to apples" comparison as to which "X" vs "H" gave the best performance. Both cars are fairly loud, but not so bad that you can't hear the radio or carry on a normal conversation. I wouldn't hesitate to buy another set.

So i have never used the Dynomax do they have a good sound and whats the cost i will be running 3" with turn downs.!

The sound is fairly deep, but not quite as much as Flowmasters. Personally I think Flowmasters sound a little better from OUTSIDE the car. Inside is a different story. Dynomax won't drive you nuts inside the car. As I said earlier the choice of an "X" or "H" pipe also affects the sound. The "X" gives what I would describe as a somewhat Nascarish sound under heavy throttle.

Forgot to give cost. Latest Jegs has 3in. as follows: center in and out=$81.99, offset/center=$73.99, offset/offset=$81.99.

I've used them and love them. Similar in design but a fuzz cheaper is the Magnaflow welded mufflers. I've got a set of the Magnaflows on a 440 now. The mufflers are right before the axle and then I have a small set of Summit 14" long glass pack style mufflers right before the turn downs at the bumper and it sounds great. It has a great low rumble at idle, a mild growl when you get in the gas a bit, and then you know its got a 440 when you romp it.

Here is a very short clip of my dad's car with the ultra flows.

http://www.youtube.com/watch?v=yuYm6LlJCW8

I agree Magnaflows are probably the same! I have them on my car (440 Dart) with headers/an X pipe and this is how it sounds:

http://www.youtube.com/watch?v=h3d-jleaRhM

Towards the end is some idling sound.

That was before I had much of an interior in the car. Now with carpet it is actually pretty quiet inside.

and here are the magnaflows breathing a bit harder
http://www.youtube.com/watch?v=K7aWoquOWWA

Thanks for all the replys, I can't wait to get them on my RR


Tom C.

Tom, before you pop for the UltraFlo Welded, look into the new Dynomax VTs. You could run the 17956 and have a sweet sound, no drone, and plenty of noise at WOT. They really are pretty darn slick. We have three sets we are playing with right now.
And, there is rebate on them too so for $75 you get state-of-the-art technology, great sound, no drone, and all stainless steel body and tubes.
Tom

got them and love them,can have a conversation when cruising,yet they openup nice when you punch the go pedal

CS, very good questions. With them constructed from all st. st. parts, corrosion is not as big of worry to me. They are cheap enough right now that I could live with the worry of the spring eventually fatiguing. I think it is 302 or one of the spring alloys of st. st. so it likely is long lived as well.

Seriously though, we just put a set of 17956's on a 12 second 68 360 barracuda. I have two more with the weaker spring (17156) coming this week and we will do a comparison between them to see what affect the spring rate has on back pressure and sound level at various RPMs. It is weird that such a short muffler, with a 3" core with minimal packing, has such little resonation and roar.

I have had 340s since 1978 and they are very tough to keep from resonating from 1800 to 2300 RPM. This muffler seams to prevent that roar very nicely.

As soon as we get the whole system sealed and leak free, I will try to get some very good sound recordings to share along with the data we plan to collect. Should get measurements later this week.

Tom Hand