Glass Packs
Postmaster
Joined: Jun 2001
Posts: 4,496
Likes: 0
I have glasspacks as well on my 351 and they sound quiet at idle and good at driving speed and they will get loud if you want them too. They will last just as long as any other muffler. As f100guy mentioned some people like to get them nice and hot then shoot some water up the pipe to break the glass up so it comes out. why I don't know they are straight through as it is, if ya gonna do that why even put them on. Oh well, I can't help but wonder what the glasspacks are gonna sound like on a 4.2 6 though BuiltFordTough your gonna have to let us know. I knew a guy that put one glasspack on a 2.8 I believe with the converters still on and it was fairly quiet sounded good but it was quiet. Good luck with your muffler desicion
Senior User
Joined: Aug 2003
Posts: 207
Likes: 0
From: Chicagoland
About the fiberglass blowing out...first time I ever say that happen was on my wife's neon. I was walking into my apartment, when I saw black strings coming out of the neon's talipipe. It was cold out, so i thought at first that a squirrel had crawled up in there to stay warm! then I realized that it was the fiberglass batting in the muffler. Car actually sounded good for a while, until my wife complained about the noise and made me put a new muffler on. Won't stop me from doing that on my car, though!
Postmaster
Joined: Apr 2003
Posts: 2,703
Likes: 4
From: Harrisburg, NE
glasspacks are great there are two 42"ers(one per side of the true duals) on the 76 that I drive,quiet and mellow at idle, but you should hear that sucker roar when you stick your foot in it!
Senior User
Joined: Aug 2003
Posts: 394
Likes: 0
your engine makes the exhaust, noise and all. you can do different things to it, but it usually only goes so far. i had a truck in high school i did too many different things to, and never sounded like a rod or roar of the newer trucks. i ran straight 2 in exhaust once, duals out the back, it was a old school rap. it was a bit restrictive but fine for a low rpm truck motor. i love that rapping sound, rrrrrrrrrrrrrrraappppppppppppp!
Junior User
Joined: Jul 2003
Posts: 86
Likes: 0
i have dual exaust straight out the back on my 1975 f150 360 with i believe 2 36in glass packs and it sounds quiet on idle but when u stick it to the floor it really raps and sounds great gets a lot of attention LOL!!!
1975 f150 360
1975 f150 360
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
Do you guys talk tech on this site. I started using glasspacks since I was 16 years old that was in 1966. Glasspacks use to be made of steel, like steel wool those burned out very easy. todays packs will last a long time unless they are placed to close to the motor. THATS NOT EVEN THE ISSUE WITH NEW CARS & TRUCKS. THE WAY THEY ARE BUILT THEY CAUSE TURBULENCE, INSTEAD OF A SMOOTH FLOW AS WITH TURBO MUFFLERS.
Senior User
Joined: Aug 2003
Posts: 207
Likes: 0
From: Chicagoland
A"turbo" muffler is simply a muffler used on a turbocharged engine. It actually has more fiberglass in it to dampen the turbo noise. if anything, it is more restrictive than a glass pack. If a glass pack was pack with steel will, shouldn't be called a steel-pack muffler? The resonator in a modern exhaust sytem is a glass pack muffler, only the diameter of the inner steel tubing is too small, therefore restrictive. Putting on an aftermarket glass pack with a larger inner tube will allow the exhaust to flow better. the fiberglass will help mellow out the sound. there is nothing directly in the flow of exhaust gasses in a glass pack, so the turbulence is minimal. a stock muffler, or "turbo" muffler, however, has baffles and redirecting chutes that can severrely slow down the exhaust gasses, and cause restriction.
Postmaster
Joined: Jun 2003
Posts: 2,656
Likes: 5
From: shepherd
a turbo muffler is not a stock muffler and they do not cause restriction like stock does. THEY are like cheap flows. they sound deep
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Senior User
Joined: Aug 2003
Posts: 207
Likes: 0
From: Chicagoland
they use baffles to cancel sound frequencies instead of fiberglass to absord sound. I agree that they do not restrict flow like stock mufflers, but they still restrict flow to some extent. Even a flowmaster muffler restricts flow to some extent. The term "turbo" means nothing in terms of muffler design. It was originally used for mufflers designed to work on turbocharged cars, but now manufacterers use the term because they think it sounds cool, and people will buy it because they think that it will add HP or something. Mufflers cannot add HP, all they can do is restrict flow as little as possible so that the engine can breathe better and produce more HP due to better efficiency.
Senior User
Joined: Aug 2003
Posts: 207
Likes: 0
From: Chicagoland
Iv'e always wanted to put a soleniod-activated Y-divertor on my exhasut system, right behind the Cat. So that the next time a jap-crap pulls up next to me at a light and revs his rubber-band motor up, I can flip a syitch and show him what exhaust sounds like.
Senior User
Joined: Nov 2003
Posts: 189
Likes: 0
Strait pipes are the best way. You really get a nice snarl from them with an agressive cam, hehehehe 
I don't mind the noise at all. that is in my 65 w/ warmed over 360. I had full system installed dual with tail pipes out each side after the back wheels.
It is not bad as long as your foot is not into it. hehehe
I don't mind the noise at all. that is in my 65 w/ warmed over 360. I had full system installed dual with tail pipes out each side after the back wheels. It is not bad as long as your foot is not into it. hehehe
New User
Joined: Jan 2004
Posts: 24
Likes: 0
From: Edmonton,Alberta
I have heard glass packs burn out your valves. i have been running them all my life and all of my friends and we have never had problems.Straight pipes are nice but it is nice to have a muffler even if it is a glass pack when you get stop by the cops.