what muffler should i run?

[screamin86]

ive got two that i had on my truck and ive got two i had for my car before i decided to part it. they sound best in a true dual design with a motor that has a lil grunt behind it imo.

[Jim Rockford]

Glasspacks make anything sound like a dumptruck with no exhaust, its horrible, and with the stupid popping when you let off, plus they flow like crap. Louder doesn't = more power .

[Armor]

I've got a set of thrust turbos on my true duals, i love the tone, but its a bit louder then id like for driving around

 although it could have something to do with the drivers side pipe having 40 rust holes along the seam.
man i hate Canadian winters, im getting a new set of manifold-mufflers already, and I've only had the truck for 2 years... oh well lol

[werewolfx13]

None of my glass packs have had a real harsh sound, all more mellow than flows..if yours have sounded like a straight piped dump truck, you need to find a better source for glass packs. Nor have ANY of the glass packs I've run popped when you let off..my flowmasters did on my '84 gmc, but not too bad. IMO, you've purchased some crummy and/or too short glass packs if they've been popping or that loud. 28" packs are pretty mellow.

[327power]

What about those Smithy's mufflers? I guess it's some sort of glasspack super old school style? I think they only come with a 2" inlet/outlet though. They sound neat IMO. Especially with a flathead engine.

[Jim Rockford]

I have never been cheapskate enough to own the crappy things.But everyone when i was growning up though that was the junk to have on their muscle cars and 4x4 trucks.

somebody asked for the information on the muffler flow in my post on my exhaust setup. here it is. i just copied and pasted from a file a friend sent me.

I have listed here a muffler shootout test done by CAR CRAFT, they show the best bang for the buck, and show the db's

The Mufflers
MAKE MODEL Part No. COST
SUMMIT Turbo 630125 $14.75
THRUSH Magnum Glasspack 24214 $16.50
THRUSH Boss Turbo 17718 $23.95
HOOKER Competition 21006 $25.95
DYNOMAX Super Turbo 17733 $28.50
DYNOMAX Race Magnum 24215 $31.95
HOOKER Super Competition 21106 $35.95
SUMMIT Fully Welded 630325 $38.69
FLOWTECH Afterburner 50322 $39.95

MUFFLER FLOW TEST

MUFFLER Flow at 28-in H20
DynoMax Race Magnum 528.64 cfm
Thrush Magnum Glasspack 507.40 cfm
Summit Fully Welded 343.38 cfm
Flowtech Afterburner 342.20 cfm
DynoMax Super Turbo 333.94 cfm
Hooker Competition 232.46 cfm
Hooker Super Competition 320.96 cfm
Summit Turbo 331.16 cfm
Thrush Boss Turbo 297.36 cfm

MUFFLER Idle dB WOT dB
DynoMax Super Turbo 89 123
DynoMax Race Magnum 94 133
Flowtech Afterburner 92 124
Hooker Competion 92 122
Hooker Super Competion 90 125
Summit Turbo 89 124
Summit Fully Welded 92 125
Thrush Boss Turbo 90 123
Thrush Magnum Glasspack 92 128

DYNO TEST
All mufflers were dyno-tested on a 355-cube SBC with 10.0:1 compression, Air Flow Research 190 aluminum heads, a CompCams 292 hyd. a Victor Jr. intake, a Holley 750-cfm double-pumper, and 1 5/8 Headman headers.


MUFFLER HP TORQUE 2,500-6,000rpmAverage
Hooker Competition 397.4 381.1 286.8hp/351.9 lb-ft
Thrush Boss Turbo 407.1 384.9 292.1 hp/357.5 lb-ft
DynoMax Race Magnum 409.5 394.3 298.8 hp/366.9 lb-ft
Flowtech Afterburner 409.7 391.2 294.8 hp/361.7 lb-ft
Thrush Glasspack 409.5 389.8 297.7 hp/365.3 lb-ft
Summit Turbo 411.5 386.3 291.5 hp/357.4 lb-ft
DynoMax Super Turbo 412.7 387.2 292.6 hp/358.6 lb-ft
Hooker Super Comp 413.8 387.2 292.8 hp/359.0 lb-ft
Summit Fully Welded 415.4 390.7 295.6 hp/362.4 lb-ft

more numbers for ya'll who like numbers.

All tests via an independent lab
All tests @ 15” wc

2 “ Straight Pipe 283 CFM
2 ¼ “ Straight Pipe 365 CFM
2 ½ “ Straight Pipe 521 CFM

2 ¼” Typical Bent tailpipe 268 CFM
2 ½” Typical Bent Tailpipe 417 CFM

2 ¼” Inlet/Outlet_ Glass Pack Tips- No Louvers- Smooth 274 CFM
2 ¼” Inlet/Outlet- Glass Pack Tips-Louvered 133 CFM
Same as above set for reverse flow 141 CFM
2 ¼” Cherry Bomb 239 CFM
2 ½” Cherry Bomb 294 CFM

2 ½” Inlet/Outlet Dynomax Super Turbo 278 CFM
2 ½” Inlet/Outlet Ultraflow Bullet 512 CFM
2 ½” Inlet/Outlet Gibson Superflow 267 CFM
2 ½” Inlet/Outlet Flowmaster ( 2 Chamber) 249 CFM
2 ½” Inlet Outlet Flowmaster ( 3 Chamber) 229 CFM
2 ¼” Inlet/Outlet Thrush CVX 260 CFM
2 ½” Inlet/Outlet Maremount Cherry Bomb 298 CFM
2 ½” Inlet/Outlet Hooker Aero Chamber 324 CFM
2 ½” Inlet/Outlet Hooker Max Flow 521 CFM
2 ½” Inlet/Outlet Borla Turbo 373 CFM
2 1/2" Inlet/Outlet Magnaflow 284 CFM

[327power]

Jim, what do you consider crappy and junk? Something thats cheap is not always junk. Sometimes the big name brand pricey stuff is actually worthless. I've learned the hard way a couple of times. 

[Jim Rockford]

I usually research alot of stuff before I buy, I'm not made of money, so I look hard to see what works and what doesn't. Glasspacks ..don't. Over the years I've done pretty good being able to look at something and know whether or not its good. yes there is some good cheap things , one example is  summit turbo mufflers,  for the price you can't go wrong, Snap on, Mac ETC. tools , that are more and more being made in china and the quality is no better than the chinese made craftsman tool that are priced much less.  Its all in experience.

[k5blazerfan]

im running 2.5 inch from my headers to my glasspacks sonds real good especially when i et it in between 3 and 4000 rpm

[str8bloc]

what bout the cherry bomb extreme i love the sound on my 350 but i went to duals so i  went with glasspacks but gonna go back to 2 extremes loud and proud here ALOT louder than flows

[327power]

Glasspacks are always my favorite. Nearly every vehicle I've owned had 'em. Matter of fact, I need to order a new set for my stepside along with my new 350, since I'm pulling the choked 250-6. Yeah! Bye bye California smog junk!!!! Ha Ha! I'm throwing the cat out on the woods!

[327power]

The glasspacks sound outstanding! Did end up throwing the cats in the woods! Ha Ha!

[Whitfield]

Glasspacks make anything sound like a dumptruck with no exhaust, its horrible, and with the stupid popping when you let off, plus they flow like crap. Louder doesn't = more power .

Jim, I'm with ya.   I hate Glasspacks!  I worked in a shop doing repairs and custom bent exhaust for 10 yrs before switching to Industrial work.  I just can't imagine anyone wanting a glass pack.  

But then I step back and look around...

Most everyone on here raving about Glass Packs is 25 or younger.  327Power was a kid when I quit turning wrenches for a living.  They may have never heard the dump truck sound.  I'm betting some Mfg has picked up the Glass Pack name and changed or improved the design.   

Give me a Flow Master 40 series any day.

I couldn't imagine replacing the exhaust on my Yukon, It is a decent system ~ Why bother?  If they only knew the crappy stock exhaust we had from the factory back 20+ yrs ago.  My Yukon is a family hauler / tow vehicle and performs very well in stock form. 

Dumping exhaust under the bed is Ok for a pro street truck or a work truck ~ But for something I'm gonna drive every day or use as a tow rig I can do with out the noise of the exh note under the bed ringing like a bell.


      

[screamin86]

the glasspack sound is something I've always disliked! Lol I like the sound of a 40 series but its too played out and they can be a little obnoxious loud also. I LOVE my magnaflow on my yukon but I don't like the magnaflow price. I've never seem to find a good sound clip on a cammed smallblock. I don't want anything very loud but don't want it whisper quiet either. I plan to finish my forged 383 that I started for one of my cars to put in this pickup so I want something that will flow enough for that motor and I know whatever setup I go with on my mild 350 the 383 with produce a lot more noise.

[Josh454]

Glasspacks sound like a wet fart.