Does anyone with the L03 TBI have glass packs? Do you have one or two. How'd you run the dual exhaust. How does it sound and feel?

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92 Camaro RS
305 TBI
T-Tops
DynoMax Cat-Back Exhaust
Gutted Cat
Hypertech Thermomaster Chip
Custom K$N open element cold air intake
Custom Interior
Window Tint

Kenwood El-Kameleon Head Unit
Pyramid 6x 9's
Jensen 5 1/4's
2- 10" Kenwood Cyclone Subs
Pyramid 600 Watt Amp
Best ET: 15.976 @ 86.01 mph
reaction time: 0.479
60 ft: 2.269

 

glasspacks suck.

 

glasspacks suck.......................

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Steve
88 Firebird TBI(WS6),TH700R4 - Open Element, Catco 2 1/2 High Flow Cat, K&N filter 14*4 element, American Thunder Flowmaster Catback Exhaust, 180 Stant thermostat, Accel cap and rotor, L98 cam

 

glasspacks suck....

 

Why would you want to even think about putting that on your car? It will make it sound like a dirt bike and not the great sound of a mussle car.

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1989 GTA Trans Am
350 5.7
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Hypertech Stage 2

 

So what are glass packs? I know they used to be a muscle car thing... waayy back when... but I can't get a straight answer from anywhere...

 

They're tube-like things, on the outside, meant to muffle sound by restricting flow. They're "packed" with "'glass" hence the name "glasspack". They're 1940's technology. Most reputable muffler companies use sound cancellation technology to muffle today.

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No guts, no glory.

 

Don't listen to them. Glasspacks are cheap as hell and some can actually flow pretty good. I've gotten sooooooooo many people saying how my exhaust sounds really good. I like them.

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92 RS carb'd 350 5-speed
Big tires, glasspacks, and a massive cam.

 

Please listen to them. Let me expand on the explaination of what they are, which should help explain why they aren't much good.

The connection to the exhaust pipe (or header collector) is the same size as the pipe, then the body of the muffler expands out to another inch or so OD. Inside, a perferated pipe is SMALLER than the inlet. The outlet is also smaller than the inlet, to force the gasses through the perferations in the inner pipe. The space between the inner perferated pipe and the outer body shell is packed with fiberglass matting - hence the name "glasspack". This matting absorbs the sound somewhat, but the center of the perferated pipe lets a lot of the noise straight through.

In order to get decent flow out of them, you need to size the outlet to your needs, and let the inlet be whatever it is. That's rarely done properly.

To give an example of their restriction, a fellow Bandimere racer had Cherry Bomb header glasspacks on his '68 Camaro 327 4-speed put on back in 1971 (I had the same things on my '57 put on in 1974). It was noisy, to say the least. Last year I gave him a pair of 2-1/4" Pacesetter turbo mufflers I got from JC Whitney about 10 years ago: he picked up .5 sec, and the car is quiet.

I never got time slips on the '57, but when I took my glasspacks off in favor of off-the-shelf turbo mufflers in 1977, it was also quieter and had more spunk.

You might be able to get glasspacks cheap, but they're cheap for a reason.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

[This message has been edited by five7kid (edited September 24, 2001).]

 

I don't want to fan any flames but I've switched from glasspacks to Flowmaster 40 series and noticed no difference in power on a built 350 in my 79 truck. I'll find what issue it is, car craft did a under $50 muffler shoot out and found glasspacks aren't bad at all, just LOUD! This was shown in dyno and flow tests. I know you can't beleive everything you read but I noticed no difference. If you're on a budget I sure as hell would slam on a $15 glass pack than sound like an vacuum cleaner with a stock muffler!!! IMO no muffler and a stock cat actually sounds pretty good.

[This message has been edited by ahusted (edited September 24, 2001).]

 

there are SOME good glasspacks made by good companies but 90% of the ones out there are the schitty $9 cherry bombs that you get at the local auto part store. They are heavy, restrictive, they'll blow out easy. NO high performance racing uses these things. That should be reason enough.

 

like i said before they suck......................

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Steve
88 Firebird TBI(WS6),TH700R4 - Open Element, Catco 2 1/2 High Flow Cat, K&N filter 14*4 element, 2 3/4 pipe with flowmaster 80 series with 2 1/2 inch turndowns, 180 Stant thermostat, Accel cap and rotor, L98 cam

 

Majority Rule= Glasspacks do suck

>It would be a bad idea to put cherry bombs on you car.

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89 Formula Firebird
Red with T-tops
5.0 305 FI
Soon to be a 400sb.

 

1 out of 10 cars I hear with glasspacks actually sounds good. The other 9 sound like muffled crap. There is this one big block Nova around my way that has glasspacks and it sounds real nice. Its the loudest nicest sounding car I've ever heard ...Maybe the glasspacks are just wore out and I'm hearing just pure motor.

 

flowmaster isn't the best either, hence the cheap prices


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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

 

The Flowmasters on my egine sound AwEsOmE!

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383 86 Camaro Z28 ---1/4 mile e.t>12.89@108.8mph,,
10.5:1compression Dart Pro 1 Aluminum heads 215cc>2.05/1.60 valves,400 steel crank,cam specs:224/234 at 050 525/525 lift,3500 stall converter,shift kit,4.10 gears,770 Holley Avenger,Victor Jr. Intake,true dual exh,Hooker headers with 40 series Flowmasters,MSD Coil and Module.ALSO SECOND GEN Z28---mods:454 BBC,.546 max lift(doug herbert cam ) 750 Holley vac sec. ,Edelbrock Performer manifold,Holley electric fuel pump,Hooker headers,Flowmaster mufflers,beefed up 700r4 tranny, 3.90 gears, powertrax unit, B&M console shifter.

 

Bwah ha ha ha ha! The Edlebrock, Dynomax, and SLP (Borla, too, I believe) mufflers used in their respective F-Body cat-back kits are all GLASSPACKS! Check their websites and see how they're built! Roving fiberglass, perforated tubes, etc., etc.

 

You don't compare a Ferrari to a Pinto.

 

half of these people on here hate glass packs because they are seeing everyone else saying that they suck. of the other half, 90% of them have never had them on their car before. glasspacks will sound good and mean if you know how to set them up right.

[This message has been edited by u r sofa king we tah did (edited October 05, 2001).]

 

The cheap ones blow out and sound like crap. period. They kicked *** on my dads truck for a couple weeks and then bamo, crap. There are better ones but people never seem to want to pony up for them so they get the $10 specials. Those are the crap ones. If you get the good ones, more power to you. Borla makes some as to show that there are good ones. My friend got some Purple Hornies. They looked pretty qualtiy. He hasn't put them on yet.

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-Tas
'89 Formula WS-6

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

To be installed eventually far far far into the future: Yours if the price is right and I don't have to ship :
Hooker 1-5/8" 50 state legal headers, Dynomax 3" I pipe (PN 44063 and 43248), Catco 3" cat, and injector spacer.

Super GRK_Taz World
F-Body Dual Exaust
EFI & Intake Options
AOL IM: superGRtaz



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