glass packs good idea or not?????????

Discussion in 'Classic Mustang Specific Tech' started by x73mach1x, Jul 22, 2005.

  1. x73mach1x

    x73mach1x New Member

    Joined:
    Jul 3, 2005
    Messages:
    66
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    maine
    k i was wonering if any one has used some glass packs on there mustang and if so how good do they work... i dont really want to spend to much money on a exhaust system at this point in the game and was wondering if glass packs would be a good cheap choice... but my concern is that the glass packs will rob me of horsepower.... my engine is going to be about 500 horse when its done and i dont want to take that away from it threw a my exhaust....
     
    #1
  2. MustangMatt1966

    MustangMatt1966 New Member

    Joined:
    Mar 11, 2004
    Messages:
    1,019
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Orlando Fl.
    when i had my engine built i didnt have money for an exhaust sysyem, so in summit there were these things called purple hornies, they are glasspack mufflers that have a turndown tip on them...they are loud as all hell and sound great...but i dont think im loosing power at all...but i think i am loosing my hearing haha
     
    #2
  3. ForceFed70

    ForceFed70 That's why they call it "dope"
    Founding Member

    Joined:
    Dec 6, 1999
    Messages:
    4,820
    Likes Received:
    1
    Trophy Points:
    69
    Location:
    BC Canada
    Personally, I don't like the sound of glasspacks at all.

    They do wear out.

    If you can afford 500hp, you can afford some decent mufflers.

    Oh... and where the heck did you find a 4speed FMX?
     
    #3
  4. Cobain03

    Cobain03 Active Member

    Joined:
    Aug 27, 2003
    Messages:
    1,024
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    Lexington, Ky
    i've got glasspacks on mine. they sound alright, not deep and throaty like i would like but they get the job done.
     
    #4
  5. iskwezm

    iskwezm Advanced Member

    Joined:
    May 24, 2005
    Messages:
    4,157
    Likes Received:
    17
    Trophy Points:
    69
    Location:
    Rowland Heights,California
    if you want to sound like the teen down the street,do it,but if you want to build this car and do it right, dont get cheap on the exhaust,youll just end up replacing it.
     
    #5
  6. THX 138

    THX 138 Member

    Joined:
    Oct 7, 2004
    Messages:
    375
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Los Angeles
    through
     
    #6
  7. mustangdave

    mustangdave My rearend needs a stud and two nuts.
    Founding Member

    Joined:
    Feb 26, 2002
    Messages:
    3,071
    Likes Received:
    0
    Trophy Points:
    56
    Location:
    North Carolina
    Glasspacks sound great on a mild car like mine, but with 500 h.p. they are going to be really loud. You won't lose h.p. if money and power are your only concerns. I think I paid about $15 each for my 2 1/2" glasspacks but that's been a few years back. I have had several people ask me if I was running Flowmasters. :rlaugh: I can't see paying high dollar for 3 h.p. and a certain sound.
     
    #7
  8. my66coupe

    Founding Member

    Joined:
    May 1, 2002
    Messages:
    1,134
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    Arizona fountain hills
    I had once considered this route when building my exhaust system. Due to funds it seemed the best and most practical way at the time. After putting one on a 440 dodge.....and noticed how much low end power i had losted, I was turned off. The design is straight through, not a single baffle, chamber etc.....making it near impossible to make back pressure. The worst part overall, is that they wear out......My original flowmaster 40s had me at start up.

    Mike
     
    #8
  9. 302 coupe

    Founding Member

    Joined:
    Mar 2, 2000
    Messages:
    1,996
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    Macon, Ga.
    I was wondering about the 4 spd FMX too...

    what are the specs on the 500 hp cleveland?
     
    #9
  10. coolblue65

    Founding Member

    Joined:
    Jul 26, 1999
    Messages:
    1,221
    Likes Received:
    1
    Trophy Points:
    39
    Location:
    Franklin, WI
    No offense to anyone that has them, but all the cars that I have heard have sounded horrible with them, they are loud though I will give you that.

    If money is a problem look on ebay, you can probably find some used flowmasters or something pretty cheap.
     
    #10
  11. mustangdave

    mustangdave My rearend needs a stud and two nuts.
    Founding Member

    Joined:
    Feb 26, 2002
    Messages:
    3,071
    Likes Received:
    0
    Trophy Points:
    56
    Location:
    North Carolina
    Coolblue, no offense taken, but on a stock or nearly stock car, they are quiet enough to carry on a conversation at cruising speed and loud when you get on it. With his h.p. levels, they would be obnoxious as crap though. In other words, the same muffler will exhibit totally different sound characteristics on a 200 h.p. car and a 500 h.p. car.
    Everybody is right though... don't put glasspacks on that engine.
     
    #11
  12. ForceFed70

    ForceFed70 That's why they call it "dope"
    Founding Member

    Joined:
    Dec 6, 1999
    Messages:
    4,820
    Likes Received:
    1
    Trophy Points:
    69
    Location:
    BC Canada
    About noise.

    Glasspacks are like any other muffler. You can get quieter and louder versions.

    In a glasspack muffler, the longer the muffler, the quieter the exhaust. Much like a regular muffer in that the more chambers it has, the quieter it tends to be.

    As a rule of tumb, glasspacks are very loud but that's because people tend to buy the cheaper and shorter versions.
     
    #12
  13. 12sec67

    12sec67 Active Member

    Joined:
    Oct 7, 2003
    Messages:
    1,303
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    San Diego, Ca
    Summit Has Mufflers That Are Supposed To Flow More Then Flowmasters And There Are Not Loud And They Are About $25.00
     
    #13
  14. ForceFed70

    ForceFed70 That's why they call it "dope"
    Founding Member

    Joined:
    Dec 6, 1999
    Messages:
    4,820
    Likes Received:
    1
    Trophy Points:
    69
    Location:
    BC Canada
    I agree with this thinking. You can get some decent no-name type of mufflers that flow well for pretty cheap. Mufflers on my truck are a good example. Sound pretty good, flow pretty good, and only cost $55 each.
     
    #14
  15. 302 coupe

    Founding Member

    Joined:
    Mar 2, 2000
    Messages:
    1,996
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    Macon, Ga.
    leave the glasspacks to the guys with beat up Z71's....they are not a performance muffler.

    The hooker aero-chamber has the best flow numbers of any generic muffler. It will flow better, be quieter, and have better sound than any glasspack.
     
    #15
  16. x73mach1x

    x73mach1x New Member

    Joined:
    Jul 3, 2005
    Messages:
    66
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    maine
    k thanx guys really apprecate it.. the cleveland isnt 500 hp yet but its going to be in about a couple of months when school starts.... my auto tec teacher builds race engines as a part time job and he said he could easily make 500 if i wanted to spend the money which im going to.... my FMX i thought was a 4 speed maybe i was wrong i dont have as much years behind me as some of your guys out there do.... i havent really looked at my tranny much im more worried of geting the car ready for interior and paint..... but what is it a 3 speed???? also sence we are on the topic what does FMX stand for and would it hold up against a high horse powered cleveland...
    PS. probally go with some 40 series flows..are hooker headers a good choice??? i was thinking about them as well
     
    #16
  17. 10secgoal

    10secgoal Active Member

    Joined:
    Dec 2, 2003
    Messages:
    2,806
    Likes Received:
    0
    Trophy Points:
    47
    Location:
    San Diego
    There is someone in the classic classifieds selling a set of used turbo mufflers from dynomax I think it was. For like 50 obo.
     
    #17
  18. x73mach1x

    x73mach1x New Member

    Joined:
    Jul 3, 2005
    Messages:
    66
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    maine
    i might have to look into that thanx
     
    #18
  19. johnsstang04

    johnsstang04 Member

    Joined:
    Jun 26, 2005
    Messages:
    80
    Likes Received:
    0
    Trophy Points:
    7
    Location:
    Phoenix, Arizona
    I put the turbo mufflers on a mustang a while back. They worked fine and had a deep sound, although I really wasn't paying attention to horsepower. As for the FMX, it might be able to handle the 500hp, but a C6 trans would probably be better. Mustangs didn't have 4 speed automatics, only three speed. The C4, FMX, and C6 are the automatic transmissions Ford used. C4 being the least capable to handle horsepower (although very reliable) and the C6 being the best.
     
    #19
  20. 12sec67

    12sec67 Active Member

    Joined:
    Oct 7, 2003
    Messages:
    1,303
    Likes Received:
    0
    Trophy Points:
    36
    Location:
    San Diego, Ca
    people tend to have the C4 built instead of using a C6 because the C6 takes some much power to turn it which leads to horsepower loss. the C4 can handle a lot of horse power if built correctly....


    ask 10secgoal! :D
     
    #20

Share This Page