Magnaflow Mufflers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

stevewhitmore · 08-27-2009, 07:05 AM

Been watching some vids on You Tube and the Mags seem to have a tendency to crackle and pop upon deceleration or when revved up at least on newer Chevy trucks. Is this a common trait of these mufflers, if so I think I will go with the flowmasters. I just want a nice mellow rumble and maybe get louder on acceleration. Any thoughts from you guys running the Magnaflows?
I will be running straight duals from headers on my 69 to the mufflers
Thanks

Jim_PA · 08-27-2009, 07:15 AM

Mine never crackle or gurgle: listen here -- there is some slight distortion in the audio.

http://www.personal.psu.edu/jxu109/t...rleytri-ys.wav

Shon · 08-27-2009, 09:32 AM

I love magnaflows!!

If anyone decides they want some let me know, I discount them!

**Stocker** · 08-27-2009, 10:02 AM

I've had my Magnaflows on for about a year now (thanks, Luke!) and love 'em. Nice deep muted rumble and not a hint of snap, crackle, pop. To me, they sound much better than hollow, tinny echo-chamber Flowmasters...

69GMCLonghorn · 08-27-2009, 10:22 AM

The only thing you might want to check out is having an H pipe installed. I can't begin to tell you how that smoothed out my exhaust! Unbelievable!

BossHogg69 · 08-27-2009, 10:47 AM

^ what he said -

if you're worried about any popping/crackling, just put an X or H pipe on it, it'll smooth out the sound and most likely boost your torque a little.

stevewhitmore · 08-27-2009, 12:36 PM

Hey Stocker,
Are you running a H or X pipe?

stevewhitmore · 08-27-2009, 12:37 PM

Are you running a H or X pipe?

big mike71 · 08-27-2009, 01:50 PM

Quote:

Originally Posted by 69GMCLonghorn

The only thing you might want to check out is having an H pipe installed. I can't begin to tell you how that smoothed out my exhaust! Unbelievable!

I have h-pipe it cost an extra $50 at my muffler shop, I think it was money well spent.

**Stocker** · 08-27-2009, 01:50 PM

Nope, didn't want the extra hardware down there since I have a transfer case in the way. Ramhorns to dual pipes to mufflers to downpipes just ahead of the rear axle.

Mudder · 08-27-2009, 02:07 PM

I think dumping them straight back from the cab like Stocker did sound the best. I have had both Flows and Mags and the Mags seem to be a little more muffled but sond sort of like the Flows.

rwolf9653 · 08-27-2009, 02:21 PM

Quote:

Originally Posted by Stocker

Nope, didn't want the extra hardware down there since I have a transfer case in the way. Ramhorns to dual pipes to mufflers to downpipes just ahead of the rear axle.

Been there, done that. It may not be ideal but I ran my H pipe behind the transfer case above the rear driveshaft. It made a big difference on deceleration pops, dut did not change the acceleration or cruising sound.

**mr48chev** · 08-27-2009, 02:43 PM

Jim, that made my dog get up and look out the window to see who was here.

Jim_PA · 08-27-2009, 03:17 PM

Quote:

Originally Posted by mr48chev

Jim, that made my dog get up and look out the window to see who was here.

NICE!

WyoGMC · 08-28-2009, 11:29 PM

My guess is the poping on decel is becuase the air fuel ratio is too rich. And a h-pipe or x-pipe will tone the popping down. I think most newer vehicles are pig rich from the factory because they install cream puff internals to save money and compensate by adding more fuel to prevent detonation. Just my .02 cents. That's how my Dodge was.

**Boog** · 08-29-2009, 04:35 PM

I recently bought my 2000 GMC and it had a single flo on it with dual tails to the bumper. I couldn't wait to ge that thing off there as the interior drone was unbearable. I had a Mag put on and is much better. Still has some drone but not nearly as much. And I can report there is absolultely no popping or crackling at all.

**FRENCHBLUE72** · 08-29-2009, 06:19 PM

Stocker glad ya like them. They did sound good just not what I was wanting and btw stocker thats a K-20 i never knew...

mtdave2 · 08-30-2009, 10:38 PM

best exhaust out there, have had mine for 6 years? or so, still love em.. and i 2nd the h pipe, its a must.

08-27-2009, 07:05 AM	#1
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Magnaflow Mufflers Been watching some vids on You Tube and the Mags seem to have a tendency to crackle and pop upon deceleration or when revved up at least on newer Chevy trucks. Is this a common trait of these mufflers, if so I think I will go with the flowmasters. I just want a nice mellow rumble and maybe get louder on acceleration. Any thoughts from you guys running the Magnaflows? I will be running straight duals from headers on my 69 to the mufflers Thanks

08-27-2009, 07:15 AM	#2
Jim_PA Registered User Join Date: May 2005 Location: PA Posts: 2,696	Re: Magnaflow Mufflers Mine never crackle or gurgle: listen here -- there is some slight distortion in the audio. http://www.personal.psu.edu/jxu109/t...rleytri-ys.wav Last edited by Jim_PA; 08-27-2009 at 07:16 AM.

08-27-2009, 09:32 AM	#3
Shon Registered User Join Date: Sep 2005 Location: sc Posts: 1,203	Re: Magnaflow Mufflers I love magnaflows!! If anyone decides they want some let me know, I discount them! __________________ 71 Cheyenne C10 LWB cam'd 6.0/T56 Swap

08-27-2009, 10:02 AM	#4
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,666	Re: Magnaflow Mufflers I've had my Magnaflows on for about a year now (thanks, Luke!) and love 'em. Nice deep muted rumble and not a hint of snap, crackle, pop. To me, they sound much better than hollow, tinny echo-chamber Flowmasters... __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

08-27-2009, 10:22 AM	#5
69GMCLonghorn Registered User Join Date: Dec 2006 Location: Porter Ranch, CA Posts: 978	Re: Magnaflow Mufflers The only thing you might want to check out is having an H pipe installed. I can't begin to tell you how that smoothed out my exhaust! Unbelievable!

08-27-2009, 10:47 AM	#6
BossHogg69 motor exploder Join Date: Mar 2009 Location: Pittsburgh, PA Posts: 2,346	Re: Magnaflow Mufflers ^ what he said - if you're worried about any popping/crackling, just put an X or H pipe on it, it'll smooth out the sound and most likely boost your torque a little. __________________ Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac Use the SEARCH function on this forum - it is your friend!!

08-27-2009, 12:36 PM	#7
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Re: Magnaflow Mufflers Hey Stocker, Are you running a H or X pipe?

08-27-2009, 12:37 PM	#8
stevewhitmore Registered User Join Date: Mar 2009 Location: Harpers Ferry, W VA Posts: 144	Re: Magnaflow Mufflers Are you running a H or X pipe?

08-27-2009, 01:50 PM	#10
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,666	Re: Magnaflow Mufflers Nope, didn't want the extra hardware down there since I have a transfer case in the way. Ramhorns to dual pipes to mufflers to downpipes just ahead of the rear axle. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

08-27-2009, 02:07 PM	#11
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,336	Re: Magnaflow Mufflers I think dumping them straight back from the cab like Stocker did sound the best. I have had both Flows and Mags and the Mags seem to be a little more muffled but sond sort of like the Flows.

08-27-2009, 02:43 PM	#13
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,586	Re: Magnaflow Mufflers Jim, that made my dog get up and look out the window to see who was here.

08-28-2009, 11:29 PM	#15
WyoGMC Registered User Join Date: Jul 2009 Location: Riverton WY Posts: 32	Re: Magnaflow Mufflers My guess is the poping on decel is becuase the air fuel ratio is too rich. And a h-pipe or x-pipe will tone the popping down. I think most newer vehicles are pig rich from the factory because they install cream puff internals to save money and compensate by adding more fuel to prevent detonation. Just my .02 cents. That's how my Dodge was. __________________ 68 GMC 91 GMC ext cab 05 Dodge Ram SRT-10........gone but not forgotten

08-29-2009, 04:35 PM	#16
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,377	Re: Magnaflow Mufflers I recently bought my 2000 GMC and it had a single flo on it with dual tails to the bumper. I couldn't wait to ge that thing off there as the interior drone was unbearable. I had a Mag put on and is much better. Still has some drone but not nearly as much. And I can report there is absolultely no popping or crackling at all. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

08-29-2009, 06:19 PM	#17
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,608	Re: Magnaflow Mufflers Stocker glad ya like them. They did sound good just not what I was wanting and btw stocker thats a K-20 i never knew... __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. Last edited by FRENCHBLUE72; 08-29-2009 at 06:19 PM. Reason: has to give stocker some rep points..

08-30-2009, 10:38 PM	#18
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,520	Re: Magnaflow Mufflers best exhaust out there, have had mine for 6 years? or so, still love em.. and i 2nd the h pipe, its a must. __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban



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