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#1062154 - 06/04/19 01:25 AM Time For New Mufflers  
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Cos86SS Offline
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Westfield, MA
I have been looking at mufflers the last few weeks and narrowed it down to Borla ProXS (40351) or Dynomax Ultra-Flo Welded(17226). The Borla mufflers are oval shaped but the Dynomax are more rectangular when looking at them from the In/Out pipes. I am leaning towards the Dynomax mufflers but I am concerned that I may be too close to the ground since they are more rectangular shaped. My car is lowered by 2" all around and my existing mufflers are oval shaped like the Borla's. Anyone using the Dynomax Ultra-Flo mufflers with their car lowered 2"? The Dynomax mufflers are 4.5" high while the Borla are 4" which is another concern for me.

Thanks for any help you can give me.


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.
#1062331 - 06/11/19 11:17 PM Re: Time For New Mufflers [Re: Cos86SS]  
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Cos86SS Offline
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Cos86SS  Offline
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Westfield, MA
Anyone using either the Borla ProXS or the Dynomax Ultra-Flo Welded muffler? Just curious as to how they sound. I plan on going with 2.25" pipe since most of the existing exhaust is 2.25".


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.
#1062338 - 06/12/19 02:24 AM Re: Time For New Mufflers [Re: Cos86SS]  
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AkronAero Online content
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Akron OH
Hey, Cos - I have a 383 with a big cam. I am running Hooker Comp 1-5/8" headers and custom bent 3" 304 SS true dual pipes with Borla XR-1 Multicore mufflers (40575) on each side with a 4.25" depth. Yes, they are loud. If I did it again, I might some of the newer Borla offerings/combinations. I am about 2" lower also with little problems (we were careful on the contours when bending). Exhaust comes out the back with pipes very close to the bumper, yet they did scuff the asphalt a few times. No problems under the car except I found one scratch/dent on one muffler where we ran over something.
Gordon

#1062342 - 06/12/19 06:41 AM Re: Time For New Mufflers [Re: Cos86SS]  
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Lugan87 Offline
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Seattle WA
Cos, like Akron, I also have Borla mufflers, but in 2.5in diameter, dual, no cats behind a decently powerful 350 and 1 5/8 headers. I'm looking to add cats to my exhaust, to cut down on smell and in the mean time, see if they'll also cut down on sound volume. The exhaust is not unreasonably loud, but it is louder than I'd like. No drone at any engine speed, and with the windows up I can keep a conversation going without issue, including with my toddler. With the windows down driving around town I have to raise my voice a bit to be heard.

On my first Monte SS, approx 20 years ago, with the stock 305, I added Edelbrock TES headers, stock routing to the single cat, Dynomax Super turbo mufflers to
2.5 in Flowmaster tail pipes to the rear bumper. I liked the sound a lot. Much quieter than the borla setup: understated, but a touch throaty.

Best of luck and let us know how it turns out.

#1062350 - 06/12/19 12:19 PM Re: Time For New Mufflers [Re: AkronAero]  
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Cos86SS Offline
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Westfield, MA
Akron, Thanks for the info. It looks like Borla or Dynomax mufflers will work out based on your setup. My exhaust pipes are Al. and also come out the back. The only time I hit the asphalt is going up my driveway (inclined) with my kids in the back seat. If I come in at an angle I can make it without touching. Still trying to decide which ones to go with. I'll post once I have them installed.


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.
#1062351 - 06/12/19 01:05 PM Re: Time For New Mufflers [Re: Lugan87]  
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Cos86SS Offline
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Cos86SS  Offline
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Westfield, MA
Lugan, Welcome to the Forum. Which Borla Mufflers do you have? I too considered the Flowmaster mufflers but kept reading that they are restrictive. The Borla and Dynomax are straight through pipes which are less restrictive. Thanks for the input and will post once I decide which way to go.


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.
#1062353 - 06/12/19 01:25 PM Re: Time For New Mufflers [Re: Cos86SS]  
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Travis Jones Offline
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Travis Jones  Offline
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Ferndale, MI
I am a huge fan of the Jones MaxFlo 3 inch mufflers, they are pretty much a magnaflow copy and sound excellent.


86 SS 6.0L LQ4, TBSS GEN IV intake, 92mm TB, 30lb injectors, Summit Stage 3 NA Cam, Stainless long tube headers, Stainless 3in exhaust, Microsquirt ECU, FABbot AR5 5-speed, Torsen LSD, QA1 Lvl 3 Suspension Kit, UMI Front & Rear Braces. Check out my build blog on Summit Racing's OnAll Cylinders https://www.onallcylinders.com/author/travis-jones/
#1062357 - 06/12/19 02:31 PM Re: Time For New Mufflers [Re: Cos86SS]  
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Cos86SS Offline
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Cos86SS  Offline
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Westfield, MA
I will check them out. Never heard of them before. Thanks.


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.
#1062363 - 06/12/19 08:03 PM Re: Time For New Mufflers [Re: Cos86SS]  
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BadSS Offline
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BadSS  Offline
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Pearl, MS, 39208
Google muffler shootout. I had the Dynomax welded mufflers on my old IROC and they were comparable to the magnaflow mufflers. Realatively quiet at idle and cruise and pretty loud once you get on it. The Borla XS mufflers appears to be pretty quite compared to the others in that shootout. That’s probably what I’d run on anything around or under 400 HP. If you think you might step up in power later you might want to go ahead and get some 2.5” mufflers and run reducers on then to hook up to your current 2.25” exhaust.


Original owner of 1985 SS black hardtop w/gray interior. Frame-on restoration - 406 sleeper w/ heavily ported FIRST TPI. However the 1.875" headers, 3.5" duals, TH400, Ford 9", notched frame, and 10-point cage w/swing-out bars might tip you off it's not a lil' ole 305 TPI. Other mods: 2" drop, 18" wheels, f/r disk brakes, and custom stereo system.
#1062371 - 06/13/19 02:09 AM Re: Time For New Mufflers [Re: Travis Jones]  
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Cos86SS Offline
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Cos86SS  Offline
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Westfield, MA
Originally Posted by thepezking639
I am a huge fan of the Jones MaxFlo 3 inch mufflers, they are pretty much a magnaflow copy and sound excellent.


Just checked them out. Wow, price is 1/3 of the Borla and Dynomax mufflers. They are made in China but they have great reviews.


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.
#1062372 - 06/13/19 02:12 AM Re: Time For New Mufflers [Re: BadSS]  
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Cos86SS Offline
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Cos86SS  Offline
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Joined: Jul 2007
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Westfield, MA
Originally Posted by BadSS
Google muffler shootout. I had the Dynomax welded mufflers on my old IROC and they were comparable to the magnaflow mufflers. Realatively quiet at idle and cruise and pretty loud once you get on it. The Borla XS mufflers appears to be pretty quite compared to the others in that shootout. That’s probably what I’d run on anything around or under 400 HP. If you think you might step up in power later you might want to go ahead and get some 2.5” mufflers and run reducers on then to hook up to your current 2.25” exhaust.


I like the idea of going with 2.5" for future expansion. Something to think about. Thanks.


86 Monte Carlo SS W/T-Tops 'Original Owner'
355 CI, Hooker Super Comp Headers, True Dual Exhaust, Comp Cam Roller Cam (XR276HR-10), Q-Jet Carb 795CFM. 200-4R Transmission. 2" Lowered Suspension.

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