Best deep muffler for 5.7

joog · Sep 10, 2024

TonyM said:
My vote goes for the Dynomax Ultraflo Welded 17221, a bit shorter that the 17223. It has that classic "bark" when the truck starts, along with that nice glasspack rumble. IMO a single 3" exhaust with this muffler just has that "OBS sound"

I've never been a fan of Flowmasters. Catchy name and fancy box is about all they have going for them.

I’ll have to look

PlayingWithTBI · Sep 10, 2024

jonlandrum said:
Borla is another great option. They make a muffler specifically for the 350 Chevy engine.

I have the 3" Borla ProXS on mine. Had on both the 350 and 383, it's almost like the 383 sounds smoother with less drone :biggrin:

b454rat · Sep 10, 2024

I wanna say cherry bomb welded, but can't remember. I bought them from Advance Auto, so whatever they carry. The shop that did was impressed with the sound. I think it spooked em when I showed them the tips, and when put them on stuck out like foot n half. Like didn't know that they could be trimmed down...

Orpedcrow · Sep 10, 2024

I just pulled a hush thrush off of mine and put a borla proXS back on. All single 3” from the cat. It’s sounds great. No drone after I ran the tailpipe out the back. It droned a little with it coming out in front of the back tire.

3” hush thrush #vortec #350Sbc #obs #gmt400 #notawelder #coldstart #automobile #exhaust

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5.7 vortec 3” borla pro xs

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The thrush is deep but had a chuffing sound on acceleration I didn’t care for.

PlayingWithTBI · Sep 10, 2024

I had Thrush glass packs on my SBCs back in the 70s - I liked the sticker that came with them but, the sound...not so much.

Orpedcrow · Sep 10, 2024

Also something to consider, all the thrush mufflers have the same diameter pipe inside the case. And it’s smaller than 3”.

99xcss4 · Sep 10, 2024

watch it there headers and glasspacks are classic but not for every one or every thing I personally am a fan of glasspacks steelpacks race-bullets single and 2 chamber mufflers do not care much for the "turbo style" mufflers

b454rat · Sep 10, 2024

I had Borla's ProXS on my tundra. It was quiet, but had a nice note to it. Louder when stepped on it, but not crazy. I have a turbo on my Yukon, single 3" in/out, sounds good, not really loud, but dunno bout drone yet cause not on the road lol. But thinking of the ProXS for the 99, dont' want it too loud. Other truck will be loud lol...

HotWheelsBurban · Sep 10, 2024

Back in the day (early 80s) we had Blackjack coated headers and Walker glasspacks with duals on our '78 GMC Sierra shop truck. Otherwise stock 350/QJ with a Corvette open air cleaner. Sounded really good, I don't recall any drone. I do well remember the way the secondaries howled when you got on the skinny pedal though!
I have a pair of corvair turbo mufflers for Rawhide, but they're a bit shorter than the blown out flow masters that are on him now. Actually these are loud, but not much drone, and if the AC is on full blast and the radio is on, you don't notice it.
I say if you don't hear this truck coming, you aren't listening! And if you don't see it or hear it, get off yer dam phone.....

Komet · Sep 10, 2024

I get deep tones and no drone from my 36" long 3" single glasspack, but it's very brappy above 3500rpm. Maybe an 18-24" long glasspack into a magnaflow would be the move for deep only.

Best deep muffler for 5.7

joog

Newbie

PlayingWithTBI

2022 Truck of the Year

b454rat

I'm Awesome

Orpedcrow

I don’t know what I’m doing

PlayingWithTBI

2022 Truck of the Year

Orpedcrow

I don’t know what I’m doing

99xcss4

92g-94c frank'n (truburban) K-2500

b454rat

I'm Awesome

HotWheelsBurban

Gotta have 4 doors..... Rawhide, TOTY 2023!

Komet

I'm Awesome

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