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Old 01-16-2004, 11:45 AM   #1
gotmud
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Glasspacks or flowmasters?

Glasspacks or flowmasters?
Any thoughts? Wanting to hook one or the other up to my stock cast iron manifolds. 68 lwb sbc307
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Old 01-16-2004, 11:50 AM   #2
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Flowmaster's (2 chamber)
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Old 01-16-2004, 12:22 PM   #3
old Rusty C10
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ive never used glasspacks but i have flowmasters and never had any problem
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Old 01-16-2004, 12:37 PM   #4
70ChevyLongbed
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I've got Flowmasters runnin' thru stock manifolds off my 307... I like 'em a lot!
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Old 01-16-2004, 12:54 PM   #5
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Flowmasters for sure I've heard what they sound like on a 350 with headers so I would think they would sound somewhat the same I know I like em' because I've sceemed up a plan to put on a set from that truck but I have to cut em' down to size cause they were off a longbed and I got a short

IMO defidently FLOWMASTERS
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67 C-10 350 with 3-speed tranny and 308 gears swb step
82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine)
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Old 01-16-2004, 01:01 PM   #6
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Neither; get dynomax ultraflows.
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Old 01-16-2004, 01:32 PM   #7
my69camaro1
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Flowmasters the only way to go, American Thunder 40's series.

Glass packs have the fake (Loud) power sound.
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Old 01-16-2004, 01:38 PM   #8
shuttermutt
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Pick up a set of Flowtec Afterburners. Take the money you'll save and buy a beer for all those guys that will realize they could've had a truck that doesn't sound like everyone else's. If you couldn't tell, I like mine.
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Old 01-16-2004, 01:41 PM   #9
JIMs70GMC
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I have summit "welded" mufflers which are chambered mufflers like the flowmasters and cheaper.
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1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.

1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm
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Old 01-16-2004, 02:01 PM   #10
CliffB
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Also Consider Outlet Tips, "Megaphone Effect"

My 72 C20 had glasspacks when I got it. I thought it sounded pretty good. Then I put on a new exhaust system with 2 chamber flowmasters (40 series). It sounds much better with the flowmasters than it did with the glasspacks.

One of the big differences in sound I have learned about is the size of megaphones if they are used. The exhaust shop explained this. We all know how a voice megaphone amplifies sound. I put on tips that are larger than the rear pipe when I put the flowmasters on the C20 truck. They work like voice megaphones and the sound waves are allowed to expand as they go from the tailpipe into the larger diameter magaphone tip before they leave the vehicle. Exhaust sound is louder than with same diameter exit tips.

My recent K20 has the same flowmaster 40s as the C20 but with smaller outlet tips. There is a difference in how they sound. The K20 is a little quiter than the C20, even with the same pipes and mufflers.

If you want louder, you can use tips that are a little or much larger than the tailpipe diameter and get more sound. Or just keep the tips the same size as the pipe and the sound will not amplify beyond what is governed by the muffler and pipe choices.

I'm not trying to be a scientist, or positive that what I observe is the only truth, but what the muffler guys told me agrees with what I hear and how I know voice megaphones work.
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Old 01-16-2004, 02:02 PM   #11
melloyello
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i have glasspacks they are noisy but kinda nice if ya wanna bug the soccer mom in the minivan next to you as shes yackin on her cell phone and puttin on her make-up instead of paying attention to the road
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Old 01-16-2004, 02:39 PM   #12
gotmud
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What size of inlet and outlet did the 68 Chevy 307 come with? I assume I want the inlet to go over the pipe and then c clamp it on.
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Old 01-16-2004, 02:54 PM   #13
shuttermutt
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I believe the factory small blocks used 2-inch, didn't they?
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Old 01-16-2004, 03:06 PM   #14
CPNEJR
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Yeah all the small-blocks are 2 in. stock size
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67 C-10 350 with 3-speed tranny and 308 gears swb step
82 Z28 Camaro 355 small block over 350 hp and a borg warner super t-10 (blown engine)
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Old 01-16-2004, 03:38 PM   #15
cdowns
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i bought bargin turbo mufflers at a local auto parts for about $20 each i've got better things to do with my money than to try and impress people with overpriced mufflers
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Old 01-16-2004, 03:46 PM   #16
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Yeah what cdowns said
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Old 01-16-2004, 03:54 PM   #17
lukecp
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Defenitly flows!

I have had both and i like the Flows 10x better!
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Old 01-16-2004, 05:01 PM   #18
SWEET7T
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Flowmasters!!!
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Old 01-16-2004, 06:54 PM   #19
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Neither. Dynomax.
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Old 01-16-2004, 07:31 PM   #20
MMGOODIE
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Whoa...slow down there

Quote:
Originally posted by cdowns
i bought bargin turbo mufflers at a local auto parts for about $20 each i've got better things to do with my money than to try and impress people with overpriced mufflers
the true idea behind mufflers is not sound but performance. The interior or should i say "inferior" design of a cheapy is almost nothing compared to the interior design of say flowmaster or comparable. I am sure you gained nothing (HP wise) from your cheapies were someone who dropped $75.00 each on the flows gained probably 15% more horse.

I am not trying to sound like an a$$ but i went through this with my wife when it came to my 71' LB. sorry if i have come off that way.

as you can tell, i think the flows are best performance wise.
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Old 01-16-2004, 07:36 PM   #21
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I have glass packs with 2 1/2" pipe and they are pretty loud. I like it but I'm not so sure how legal they are. One thing for sure is the soccer moms don't like 'em.
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Old 01-16-2004, 08:29 PM   #22
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HOOKER AREO CHAMBERS
HOOKER AREO CHAMBERS
HOOKER AREO CHAMBERS
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Old 01-16-2004, 08:35 PM   #23
71swb4x4
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Flowmaster - had them on my last 2 trucks - great mufflers.

Shawn
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Old 01-16-2004, 09:11 PM   #24
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Dynaflow will out flow anything you can find, FlowMasters have a reputation for the welds coming loose and choking the exhaust. Glass Packs do not flow very well at all and are probably the worst decision you could make.
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Old 01-16-2004, 09:16 PM   #25
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I just got two new flowmasters delivered for 91.98 here is the link where i got mine he has them in most inlet outlet configuration and sizes.

If this auction isnt the size and conifg your lookin for he has links for the other styles of two chamber flows

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2454453908
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