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glasspack

This is a discussion on glasspack within the External Engine forums, part of the LSx Technical Help Section category; Im just curious as to how you guys fell about glasspacks. I had one on my 2000 formula and i ...

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    its short but its skinny. jiveass's Avatar
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    glasspack

    Im just curious as to how you guys fell about glasspacks. I had one on my 2000 formula and i loved the sound. It had a mellow rumble at regular driving and really got aggressive when i stepped into it. When i took it to a dyno day at a local shop, everyone was askin what kinda muffler i had and sayin how it sounds so bad ass. Im wondering if there is any downfall to having a glasspack compared to the usual mufflers used such as magnaflow and whatever else is common. I never see anyone on here use glasspacks.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Imho, glass packs sound best when close to the header collectors.. Further down the line not so much.. Too much crackle and pop..
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    its short but its skinny. jiveass's Avatar
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    Quote Originally Posted by Smittro View Post
    Imho, glass packs sound best when close to the header collectors.. Further down the line not so much.. Too much crackle and pop..
    mine was near the rear of the car and had no crackle or pop...but then i had stock manifolds and cats....

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    Member Rob Mellinger's Avatar
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    Here is mine, summit glasspack cold start idle, mods in sig.http://s604.photobucket.com/albums/t...t=102_0337.mp4
    LS6 intake,B&M short shift, Pacesetter ceramic lt, ory, umi subframe connectors, umi lca, slp lid, tr 230 cam, comp 918 springs,centerforce dual friction clutch, Frost tune.

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    Member Rob Mellinger's Avatar
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    Member tpilews's Avatar
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    Quote Originally Posted by Rob Mellinger View Post
    Holy hell, I turned my speakers up cause I couldn't hear it very well, then..... "VROOOOOOOOOOMMMMMMM". That's loud. Sounds mean as hell though.

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    its short but its skinny. jiveass's Avatar
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    that thing sounds pretty damn good....

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    Member Rob Mellinger's Avatar
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    After the headers the slp loudmouth was too loud for me, so being low on funds I got on summit website and closely matched the overall size to their glasspack. Now after the cam install its wayyyy loud again. Its very raspy on the street. My poor neighbors.

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    Member Rob Mellinger's Avatar
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    Thumbs up

    Quote Originally Posted by jiveass View Post
    that thing sounds pretty damn good....
    Thanks.

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    Member unibuga's Avatar
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    Quote Originally Posted by Rob Mellinger View Post
    Here is mine, summit glasspack cold start idle, mods in sig.http://s604.photobucket.com/albums/t...t=102_0337.mp4
    what exactly is your exhaust because i want to sound just like it

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    Member Rob Mellinger's Avatar
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    Pacesetter lt headers, pacesetter ory, no cats, slp loudmouth cat back with a summit glasspack in place of the slp muffler.
    Last edited by Rob Mellinger; 09-16-2010 at 04:41 PM. Reason: show sig

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    Member unibuga's Avatar
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    Quote Originally Posted by Rob Mellinger View Post
    Pacesetter lt headers, pacesetter ory, no cats, slp loudmouth cat back with a summit glasspack in place of the slp muffler.
    Did it sound a lot different before the cam?

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    Member Rob Mellinger's Avatar
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    It wasnt as loud, it still sounded about the same.
    Last edited by Rob Mellinger; 09-16-2010 at 04:45 PM.

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    Member unibuga's Avatar
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    Basicly the set up I planned on doing was pasetter lts ory then loudmouth....but I heard it was raspy so I think the glass pack would help

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    its short but its skinny. jiveass's Avatar
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    I wonder if glasspack has power advantages since it's a strait thru design.

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    Member unibuga's Avatar
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    Quote Originally Posted by jiveass View Post
    I wonder if glasspack has power advantages since it's a strait thru design.
    i have an 83 chevy blazer with a N/A 6.2 diesel i had true dual 2.5" strait pipes from the manifold back ....got pulled over so i had to put on mufflers so i did 18" glasspacks and they hurt the performace alot but i still think they are better than a conventional style muffleer

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    Member xmarkx's Avatar
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    Quote Originally Posted by jiveass View Post
    I wonder if glasspack has power advantages since it's a strait thru design.
    if you want a real strait through design just get a LM1. it's leteraly just a hollow pipe with "slp" stamped on it. that's why it's so loud because essentialy your driving around with no muffler, which is why instead of wasteing money on a LM1 cat back I cut off my muff with a sawsall and got a turn down tip. it sounds exactly the same as the LM1 set up lol

  18. #18
    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by jiveass View Post
    I wonder if glasspack has power advantages since it's a strait thru design.
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    David Vizard wrote about the glass packs in his book "How To Build Horsepower" and if they are the kind which has tine louvers or small cups that rise into the flow, they can kill your flow. On the other hand, if you install them backwords, they can flow pretty good. I believe most glass packs today have the small slits instead of the cups.

    I prefer the sound of a two chamber flowmaster myself, except I hate the noise in the cabin when cruising on the freeway.

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    its short but its skinny. jiveass's Avatar
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    Quote Originally Posted by bobage24 View Post
    David Vizard wrote about the glass packs in his book "How To Build Horsepower" and if they are the kind which has tine louvers or small cups that rise into the flow, they can kill your flow. On the other hand, if you install them backwords, they can flow pretty good. I believe most glass packs today have the small slits instead of the cups.

    I prefer the sound of a two chamber flowmaster myself, except I hate the noise in the cabin when cruising on the freeway.
    I love the sound of glasspacks when done right...how would turning it backwards effect the sound?
    Quote Originally Posted by jiveass View Post
    john, think of the ls1 as the chuck norris of all engines....there isnt a bearing on earth that can stand up to its huge cock of a rotating assembly....its just that bad ass....besides..even with my engine out, i can still smoke your ford....
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    Quote Originally Posted by jiveass View Post
    Yes...this engine wanted to take a break from kickin ass so that it can pursue a career in acting..but will soon realize that no one will hire it due to it being so bad ass, and thats a liabiliity....

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