how heavy is the exhaust on a 75 308 GT4 | FerrariChat
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how heavy is the exhaust on a 75 308 GT4

Discussion in '308/328' started by zman, Jul 4, 2014.

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  1. zman

    zman Formula Junior

    Jan 14, 2006
    356
    Toronto, Ontario
    #1 zman, Jul 4, 2014
    took the exhaust muffler off the car today as I have a leak on front header and this muffler is really heavy. is this normal.....could it be a cat?
    It's a series one car built march 75 and says US non-catalyst and as far as I know this isn't suppose to have one. Could it have been changed?
    Anyone know exactly how to tell.....numbers....etc...muffler is in good shape with minimal surface rust.
    How about the weight....diff.
     
  2. robertgarven

    robertgarven F1 Veteran
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    Feb 24, 2002
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    Robert Garven
    #2 robertgarven, Jul 4, 2014
    it is heavy
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,846
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #3 Steve Magnusson, Jul 4, 2014
    Last edited: Jul 4, 2014
    No, it's a thermal reactor muffler (it is a very well-insulated muffler which keeps the temperature inside up so the "reaction" between the oxygen in the air injected by the air pump with the unburnt hydrocarbons occurs more completely - the multi-wall construction plus the insulation material makes it heavy).
     
  4. zman

    zman Formula Junior

    Jan 14, 2006
    356
    Toronto, Ontario
    #4 zman, Jul 4, 2014
    Should I keep it on the car or should I get a regular lighter muffler? I'm not gopig to get rid of it as it's pretty good shape as it has the fake straight out tips and goes down.
    What should I use?
     
  5. tbakowsky

    tbakowsky F1 World Champ
    Consultant Professional Ferrari Technician

    Sep 18, 2002
    19,970
    The Cold North
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    Tom
    #5 tbakowsky, Jul 4, 2014
    About as much as it weighs..;). It thinks it's 40lbs
     
  6. robertgarven

    robertgarven F1 Veteran
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    Feb 24, 2002
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    Robert Garven
    #6 robertgarven, Jul 5, 2014
    I gave mine to GT4 joe, he needed it and even though I am a sticker about correctness, this where I drew the line. I got a TUBI which i love but I dont think they make one for the GT4. It weighs about 15 lbs.... The thermo reactor. The original techs called it the barbecue weighs more than that as I could not lift it by myself and I can easily lift 50 lbs....I would keep it and buy a high performance exhaust but that is just my opinion...
     
  7. GT4 Joe

    GT4 Joe Formula Junior

    Oct 19, 2010
    835
    Dana Point, Ca.
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    Joe Williams
    #7 GT4 Joe, Jul 5, 2014
    This.
    The TR is only for die-hards like me who think they are keeping their cars original, only to suffer in the performance department. Of course California smog rules come into play here, even though a '75 is exempt.
    It's your car, build it the way you want it!
     
  8. zman

    zman Formula Junior

    Jan 14, 2006
    356
    Toronto, Ontario
    #8 zman, Jul 5, 2014
    if I keep the original muffler, what can I do to it? can i paint it, anodize it etc?
     
  9. VIZSLA

    VIZSLA Four Time F1 World Champ
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    Jan 11, 2008
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    David
    #9 VIZSLA, Jul 5, 2014
    It makes a fine boat anchor.
     
  10. Brian Harper

    Brian Harper F1 Rookie
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    Feb 17, 2006
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    #10 Brian Harper, Jul 5, 2014
    I weighed mine when I took it off. I don't remember for sure, but I think it was 80 lbs. It was fricken heavy. I could barely lift it. I don't think there is any horsepower performance improvement to taking it off, but losing 40 lbs will mean something for performance. The Magnaflows I replaced it with sounded nice.
     
  11. zman

    zman Formula Junior

    Jan 14, 2006
    356
    Toronto, Ontario
    #11 zman, Jul 5, 2014
    Where did you get the manaflow I can't seem find them
     
  12. Brian Harper

    Brian Harper F1 Rookie
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    Brian Harper
    #12 Brian Harper, Jul 6, 2014
    Go your local muffler man and he can whip something up. Nothing pre-made as far as I know.
     

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