Anyone have the Dynomax Super Turbo Mufflers " 17747 on their car ?





Im looking for feedback. Ive listened to some cars with them and so far so good. That said, none of the ones Ive found were hemi cars or even big block mopar cars . Mostly small block A bodies and some GM cars

My car has old Year one repop hemi mufflers from 20 plus years ago,,,. and quite simply,,,are too quite. And Im looking to upgrade without getting obnoxious.

Pretty sure I had them on my old Hemi car - full 2.5" system, modified the tips to take 2.5" in - and they were crisp, fairly loud @ full throttle.
That car sounded great, and like it meant business.
Have them on my '68 383 car, otherwise stock system, no tips (base model RR), much quieter no matter what.
The 383 has less CR (9.5 vs the Hemi's 10.8), which does flatten the tone, so to speak, not as crisp-sounding.
My '69, with more CR (actual NHRA spec) but replacement stock system with tips, and a slightly bigger cam than the '68, sounds great, more like my Hemi car.
Tailpipe size matters for decibels, as you likely know; and '68-'70 cars with the factory tips always sound better to me.

You might try the straight through "turbo" mufflers - sounded good on Engine Masters, and IIRC, less loss in HP than the U-turn architecture.
I don't recall if they have a welded case instead of the stock or stock-ish crimped style.

Bill are your "hemi" mufflers like this with center in and offset out, a perforated inside pipe?

The Dynomax Super Turbo Mufflers 17747 and listed as the quietest of the bunch?? I had the Ultra Flo SS polished on the '68 RR and really, really liked them. For what it's worth I currently have the Flowmaster chambered mufflers Series 40 on the '69 GTX and they are TOO LOUD and they have it terrible, terrible resonance right at normal cruising speed (4-speed/3.54) and my wife can't stand it....I guess that's why I haven't changed them to the Dynomax Ultra Flo SS that are new and sitting on the shelf . IMO you might like the Ultra Flo welded as they are even louder than the Ultra Flo SS and for sure louder than the Super Turbo's.

One thing I can't understand is why the "welded" Ultra Flo (bottom or last image) is listed as "louder" than the, what looks to be the same internal design, Ultra Flo SS polished muffler (first muffler image)??

#1 muffler image = Ultra Flo SS Polished

#2 muffler image = Super Turbo 17747

#3 muffler image = Ultra Flo Welded

Mike

Bill another not so good thing about the Super Turbo muffler is the "flow rate" as compared to the Ultra Flo and the X, BIG difference!

https://www.dynomax.com/mufflers/

Ok so if you are taking. About super turbos, I had them on an e body and maybe was what I had on the last 69 rr. They were what I’d call a generic street performance sound. With the heat riser blocked, they drone around 2500 rpm. You might want to run some sort of little resonator. I had an x pipe on the challenger, an h on the rr.

I’m thinking of getting repop hemi muffs from accurate and running factory style resonators to factory style tips on the GTX. I’m tired of the ca turn down bs.

Were they the short case super turbos ? I have those on my 69 383 dart , no H pipe , full 2.5" system and the drone is horrible , I have the mufflers Bill is asking about but haven't installed them on anything yet. I'm going to switch to the Ultra flow and probably put an X pipe on the Dart .

I have them on my 'Cuda. First behind the 500" wedge and now behind the 540" Hemi. Typical glass packed muffler; they get louder over time (years) and the drone is noticeable. But the drone is easily addressed by putting any cheap glass pack (bullet) behind the axle.

Personally, I like the sound; not too loud, I can listen to the radio at cruise. But enough rumble to get noticed. Much like the original exhaust sound, just louder and with some more rumble. Some brands of mufflers change the sound. Everything sounds like a rustang or pick up truck with certain brands of mufflers. The Super Turbos don't do that.

The Dynomax Super Turbos are great if you don't like power. They sound good, fairly quiet compared to some other mufflers, but they are very restrictive.

My car is street hemi with approx 11.2 to one compression. A VERY mild flat tappet cam in the 500 lift range ( dont have cam car handy ) But it can idle just under 1000 with no problem or noticeable lope

Stock H pipe in ft and stock tailpipes out back

My car
https://www.youtube.com/watch?v=qz5UFRtnWWw


https://www.youtube.com/watch?v=0wV1myYnCn8

Im not after every ounce of power. I dont race it and rarely beat on it.

Ive had a lot of people comment its doesn't sound like it should considering its a hemi car

The 383 car I owned. But these were a 2.5inch TTI system

Im more than a little curious how much a change , if any it will be with my hemi car and 2.25 tail pipes

https://www.youtube.com/watch?v=H1eP_QMFfMU


Something tells me if I go with the Ultra Flows and a straight thru design, Im not going to like it, I have a feeling its TOO loud

How about a side by side test?

I also have Doug's electric cut-outs. Have had them for 20 years on both the big wedge and this big Hemi. We have a cool 1/8th mile strip 5 minutes from me that I used to hit regularly. Especially when they had the KOS series going. My car was 2 time class champion. So, I have ran it many times through the full exhaust and with the cut-outs open.

Why don't you guess the actual difference in ETs?

Same here. Ive looked / listened to multiple vidoes of the short case design, and everyone mentions a drone. At which speed seemed to depend on car and exhaust type ( Headers or not ) And THAT is not acceptable for me

Mike, Offset in and center out

No idea on the interior design.

My car has 3.91's and exhaust manifolds , drone was around 30-40mph , right at the speed I mostly drove it. The car is basically going to be a race car so I shouldn't be too bothered by the sound of the ultra flos., but like you on a cruiser I don't want something obnoxious .

I don't think the hemi mufflers have the u bends in them like the super turbo ... I'd love to cut one open ... which I read is based off a design by David Vizard ... Sonic Turbo ... according to Vizard his design didn't cost HP, he has a youtube video about them.

I remember having them on my dads 340 duster with headers back in the early 80's ... this period of my life wrecked my hearing ...

Some years ago, Car Craft (Frieberger?) did a flow test and maybe a dyno test on a bunch of mufflers and the Super Turbo did really well.

https://bangshift.com/forum/forum/bangshift/tech-section/3202-some-muffler-test-info

Somewhere I have the issue with the test in it, but who knows where it is anymore.

Once I change them up. I'l cut one of the repop hemi mufflers open for a look see

Don’t remember. 15-20 years back. I’d have to say they weren’t a super long case.

No need to cut them Bill if they are correct, you should be able to see through the "Hemi" mufflers as they are the same design with the angled, perforated inner pipe as the Dynomax Ultra Flo SS and welded from what I remember? I have a set still in the boxes that I got back in the '90's that I might be able to get to, but do I want to open the unopened boxes ? Someone here has to know if they are the same design as the Ultra Flo's ?