I've recently bought a 99 expedition, and I want to increase/deepen the exhaust note. Will I have any problems with installing glasspacks in place of the factory muffler? Will I lose any low end torque or will the CEL come on? It has a superchip installed (one of the old-skool blue PROMS) - Will i have any issues with that? I have no other mods on the truck.

 

ditch the packs. get a dynomax bullet. deeper, loud, better sound for the same price. and no you wont have issues.

 

Either a Bullet or Magnapack. Glasspacks scream white trash.

 

Vote for bullet or magnapack

 

yes there is, glasspacks sound like s&*%.

 

haha! fair enough

 

magnapack or SLP loudmouth 2

 

Yikes! No love for the Cherry Bombs here. I guess I was just being nostalgic, since they're made in the next town over from me, and I toured the factory in 8th grade shop class. Guess I'll man-up for something better.

 

Nope, no love Chitty Bombs here, lol.

 

Everyone screams either Magnaflow or Bullets...

It's your truck, run what you want. If you like the "loud redneck truck sound" go for it.

Your not going to be able to tell the difference between any of them when you swap your OEM muffler besides sound...

 

I was low on cash and my duals were falling apart, so I bought a glasspack, section of pipe, an elbow, and reused a tip off the old system. Dumped it in front of the tire.Cost a little over $40 in parts. Me and everyone else who has heard it before loves this sound over the dual setup. Although I will say this, whoever did the piping sure hacked the crap out of it. Crushed every bend. Wasn't the greatest sounding, kinda quiet for my likings. Although the glasspack isn't much louder, just better sounding.Oh yeah, the original was a single in dual out Magnaflow .

 

lol,im ALWAYS low on cash(ole lady always has home upgrades)thats why im getting the cheapo SI/DO thrush,and gonna leave it at the axle,lol

 

There would be no problems installing any name brand muffler on your vehicle and there will be no loss of torque, backpressure, CEL issues, etc.

Please be advised that the term "glass packs" would include:

Allied
Edelbrock
Borla
Magnaflow

Hooker
All of which use packing material which although is not fiberglass (as no one has used in 20 years), they each use a sound material absorbing design. Even conventional "glass packs" are proven in flow testing to out perform many of the so-called "Free Flowing Real Mufflers". For reference, WyoTech, Hot Rod Magazine have numerous published articals on this. On the net, please read:

broaderperformance.com/muffler_flow_tests.htm (Independently tested cfm flows of the more popular mufflers, glasspacks and resonators.

http://www.popularhotrodding.com/eng...../index1.html (this is an indepth artical that tests not only the mis-conception of flow demand but also how placement of a muffler (a glass pack in this dyno test) can actually "fool " the system into thinking that it is essentially a straight pipe.

I have listed here a muffler shootout test done by CAR CRAFT:

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

While there are mufflers that will out flow a glass pack design, it also depends on the design. Does the glasspack use "louvers or perforations" - Louvers reduce the flow by as much as 50% but Allied resonators (that sell for $20-$40) each and available at any muffler shop) installed backwards in independent test flowed 90%+ of a "race spec muffler". Others using other brands consistantly showed similar results.

 

wat......the.......fuh?!

 

Who wants while they read all that?