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#1070884 - 05/29/21 02:45 PM Mufflers...Quiet  
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Crusher Offline
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I know some may not understand but.... I have had Flowmaster 42553 50 series mufflers on my car since 1999. Even though they are not obnoxious I want to go as quiet as I can. Any suggestions? How about adding resonators to my existing exhaust. Right now it is headers, h-pipe, 3 inches into flowmasters, and 2.5 inches out.

Last edited by Crusher; 05/29/21 04:40 PM.

1988 502/502
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#1070886 - 05/30/21 02:37 AM Re: Mufflers...Quiet [Re: Crusher]  
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Based on my person experiences with FlowMaster, DynoMax, Borla, Holley, and Edelbrock.

With the power you're making, the best compromise for quiet and power IMHO are the Borla ProXS oval mufflers.
https://www.borla.com/products/universal-mufflers/proxs/

The DynoMax Ultra Flo Welded oval mufflers are a close second. Link has filters to pick the one that will fit best.
https://www.dynomax.com/mufflers/ultra-flo-welded-mufflers

Both the ProXS and the Ultra Flo are fairly quiet (considering) at idle and cruise, with the UltraFlow being slightly louder, especially at WOT. You'll have to "re-tune" and you should notice a bit more pep from the engine with either one.

The best muffler with power as the main consideration while still staying somewhat civil are the Borla XR1 Sportsman (16" casing) - they come in larger inlets, but are all center in/out and 2" longer than the ProXS, making installation a bit challenging.

#1070887 - 05/30/21 03:21 AM Re: Mufflers...Quiet [Re: Crusher]  
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AkronAero Online content
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Crusher - man that's a lot of meat! When you've got it you don't need to announce it... (adage about wearing a big belt buckle....)

Kevin, would you expect these perforated/packed mufflers to be quieter than Crusher's Flowmaster 50?
Borla now selling resonators to add to crate mufflers to tame them a bit? Any thoughts? Too late for me to add....just curious.

Gordon

#1070891 - 05/30/21 03:17 PM Re: Mufflers...Quiet [Re: AkronAero]  
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BadSS Offline
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Originally Posted by AkronAero
Kevin, would you expect these perforated/packed mufflers to be quieter than Crusher's Flowmaster 50?
Borla now selling resonators to add to crate mufflers to tame them a bit? Any thoughts? Too late for me to add....just curious.


Oh yeah, especially at idle and cruise. The Borla, Ultra Flo, and MagnaFlow are louder under WOT - but I'd rather have that than the other way around!!!

I checked to see if there was a decent video that showed a fairly good representation. The one below is pretty good showing that the MagnaFlow is considerably quieter at idle (it's closer to the camera also) and considerably louder at WOT while outside the car. My comment on being slightly louder under WOT is based on an Ultra Flo muffler comparison from inside the car.

Jump to 2:00 to get the start of the comparison.
https://www.youtube.com/watch?v=Wkw4Q2r3a2M

Edit: The packed muffler will get louder over time. Not that big of a deal for a weekend cruiser, but long term daily driver will notice a difference over time. It's a gradual increase so it's not that noticeable from week to week, but here's the same truck a year later with the MagnaFlow. I believe the packing is better in the Borla mufflers, since I have noticed more a change in sound with the Ultra Flo compared to the Borla mufflers.
https://www.youtube.com/watch?v=ZP7d1V8IsVc

Last edited by BadSS; 05/30/21 03:36 PM. Reason: Added info on sound over time.
#1070895 - 05/30/21 09:07 PM Re: Mufflers...Quiet [Re: Crusher]  
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Crusher Offline
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Thanks for the feedback but they all seem as loud as my FM's. I want quiet, quiet, quiet. As quiet as I can get it. I'm guessing that might be a dream.


1988 502/502
ProCharger SC
Fast XFI Fuel Inj.
637 RWHP 587 TQ
http://SSMonteCarlo.com
#1070897 - 05/31/21 01:14 AM Re: Mufflers...Quiet [Re: Crusher]  
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Walker part # 21584 might fit the bill, it depends on the exhaust system size you need!!


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#1070899 - 05/31/21 03:04 AM Re: Mufflers...Quiet [Re: Crusher]  
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Originally Posted by Crusher
Thanks for the feedback but they all seem as loud as my FM's. I want quiet, quiet, quiet. As quiet as I can get it. I'm guessing that might be a dream.


Yep, that's a pipe dream. Get it?? Pipe,,,, dream?

Seriously, the Borla ProXS will/should be quieter than the FlowMasters at idle and cruise. It should also give you an increase in performance over the FlowMasters, but it's not going to quiet, quiet, down a 637 RWHP, blown 502.

Back around 87 when I was making around 500HP on engine, I was running a set of 3" DynoMax Turbo mufflers (part# 17792). Most other hotrodders were running FlowMasters and back then the word was the FlowMasters made more power than any other muffler. So, I bought the biggest set they made - even had to use a BFH to get them to fit. The car was slower and a lot louder with the FlowMasters. The car slowing down would have been enough for me to change, but it was my daily driver and the cabin volume was considerably louder with the FlowMasters. Glad I kept the Turbos, because about two weeks later they went back on the car.

I eventually ended up making a little over 600FWHP and bumped up to dual 3.5" Borla Sportsman mufflers. They were louder than the Turbo mufflers, but still not as annoying as the FlowMasters. It's been a long time, but I believe it picked up about 0.2 seconds N/A and almost 0.4 seconds on the button.

That said, the quietest mufflers I ever had on mine was the 17792 Dynomax Turbos (check out some YouTube videos). You'll be giving away some power compared to a set of Borla ProXS mufflers at your power level, but the car might not be any slower with them (a good chance you might pick up some power over the FlowMasters), but they'll be the quietest mufflers you can run without totally choking the car.

A multi-muffler set might not be all that bad. Maybe a set of the 4" body 3" Dynomax Bullet mufflers up front with a set of Borla ProXS mufflers in the stock location? My G8 GT had 2 catalytic converters and 5 mufflers! A center dual in, dual out, two bullet mufflers, and two cans out back. You literally could not hear it running. I deleted the three up front and at least now you can tell it has a V8 in it.

#1070914 - 06/02/21 01:18 AM Re: Mufflers...Quiet [Re: Crusher]  
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Catalytic converters can also muffle exhaust. I put on a pair of high-flow cats at the collectors, a 2.5-inch Pypes X pipe system, and Pypes Violator mufflers. At idle it is quiet. At cruise it is quiet, apart from the interior drone at about 2200 rpm that it had since new. At WOT, it is loud.

#1070920 - 06/02/21 05:36 AM Re: Mufflers...Quiet [Re: Crusher]  
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Kevin you know those new fangled electric cars don't make any noise. Oh, you do know that now!
Just busting on you.

Small resonators help a lot but there isn't much room under these cars to get to carried away with resonators, especially if you want them behind the x-pipe.

Can't speak to what is a quieter muffler. But can say the aftermarket has supplied a lot of loud mufflers for "that sound". A couple weeks ago we had 550 cars parked on the main street in town. Possible every exhaust note you can imagine parking and leaving over a 3 hour evening. Some you wonder if they needed ear plugs to drive the car home. But my brother in law with the 36 Plymouth, blown 357 hemi, put it best. When you are parading it all about the sound, the blower, gear drive, cam, exhaust to draw attention to the car.

Some of the Borla systems on these new pony cars are ridiculously loud, obnoxious. How do you drive that home at 1 am?

Can say my 62 Nova had two Corvair Spider mufflers which were the hot ticket of the day. Actually they were the birth of the turbo muffler era. My future father in law made me back it down the street a few hundred feet before i started it late on date night. A big roller cam and those mufflers it was moderately loud. A State Trooper stopped me once, couldn't give me a ticket for loud because his partner wasn't with him. Needed two options to write that ticket.

Hooker may have something. The Dynomax is Walker's upscale muffler line.
Something quieter usually means a little less power, hardly noticeable on that car.
Bob

#1070924 - 06/02/21 11:46 AM Re: Mufflers...Quiet [Re: Crusher]  
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Crusher Offline
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Hey Bob.....loud is the new quiet. My Hellcat is very loud and all stock. Can't tell you how many times I've been asked what exhaust system I have on it. Not a fan. Must be my age.


1988 502/502
ProCharger SC
Fast XFI Fuel Inj.
637 RWHP 587 TQ
http://SSMonteCarlo.com
#1070927 - 06/02/21 08:57 PM Re: Mufflers...Quiet [Re: Crusher]  
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FinallySS Offline
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Nice Sunny Hawaii
I'm not sure how quiet you want, and not sure they make for 3" pipe, but I once had 85 Gutless. Muffler was located between the rear-end and the gas tank, and it went pretty much the whole width of the car. Single in, Dual out. Very very quiet but hey, the car had 307 Olds. I soon changed it to Camaro muffler, same configuration but it had more throaty sound I was looking for. That was after I put 200-4R, 3.73 rear from SS with posi, was planning to put SBC instead of Olds and yada yada yada, but got into accident ( C&C truck was parked on a freeway, right on the road, after the blind curve but hey! It was my fault because I smashed into it. Yeah, that was before the cell phone with nice camera days..................I did fight the insurance company but they wouldn't budge. It was gecko) and smashed the whole front end, and front frame was bent. Hence my SS now.

Anyway, like I said, I'm not sure how quiet you want, but worth a look?


1986 Silver MCSS - Poly bushing and Hotchkis spring w/Bilstein, Posi w/3.73, MSD 6-AL, E-Brock 600cfm, Aluminum 2-row radiator.
1986 Black MCSS - R.I.P............Finally.
#1070928 - 06/02/21 09:55 PM Re: Mufflers...Quiet [Re: Crusher]  
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Fred SS Offline
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My Cat-Back exhaust is from Hooker. It came with their Aero-Chamber mufflers, 2.5 inch in/out. No packing inside, just several baffles. Concerning noise level, I would say they were fairly decent at idle. You could tell the exhaust is not stock but not very loud. At cruise, they did sound good not objectionable. But when decelerating from a WOT run, they did seem to make allot more noise and vibration that I could feel in the car. At WOT, they are loud..

I removed them ONLY because they are larger than the typical oval shaped muffler. They are not oval. All sides are flat with 8 sides. I had to remove my 3.5" Denny's driveshaft once for some work and I could not drop it between the mufflers. I even bought a hydraulic tool with spreaders and I spread the pipes/mufflers apart and could barely get the driveshaft down. So I switched to old school, Thrush mufflers. Probably lost some power, but sound is a decent low rumble at idle and noticeable sound at WOT. Cruise is quieter than the Hooker Aero-Chamber mufflers.

Fred


87 SS, Harwood cowl induction hood, UMI trailing arms. Hooker 2050 Headers (Jet Hot Coated). Hooker Cat-Back Exhaust, Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, TCI 2400 stall converter, Denny's 3.5" Driveshaft, GBodyParts GNX Replica Wheels 18x8 & 18x9.
#1070930 - 06/03/21 01:42 AM Re: Mufflers...Quiet [Re: Crusher]  
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Pypes recently introduced their version of a turbo style muffler; they say its the quietest of their line. For quiet in 3 inch, I 2nd Dynomax Super Turbo mufflers, and if needed, put a bullet style muffler in front of it.


88 SS Black/Oxblood. Power Tour car
80 Malibu 2dr. Drag Week car
#1071071 - 06/14/21 02:43 PM Re: Mufflers...Quiet [Re: Crusher]  
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Before my swap, I ran a Dynomax full system..it looked very original underneath and fit well.
Doesn't show on their website anymore.
I still run the Dynomax tailpipes with the LS.

Last edited by upflying; 06/14/21 02:46 PM.

86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1071346 - 07/15/21 12:53 AM Re: Mufflers...Quiet [Re: Crusher]  
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