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  1. #1
    Member
    Join Date
    Mar 2010
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    Upstate NY
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    178
    Corvette(s)
    2004 Black Coupe, 1977 Yellow T-Top

    Default '75 exhaust system

    Could someone tell me if 1975 frames came with a two hole cross member for dual exhaust or with one hole cross members for y pipe exhaust. I have been researching this question and don't seem to be able to find a consistent answer. I have seen pictures of '75 frames with two holes in a cross member but, have seen pictures of and looked under some 75's that have y pipes. Could the two hole dual exhaust have been an option or available only on L82 models?

  2. #2
    Member
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    Aug 2004
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    Moon Twp. PA
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    136
    Corvette(s)
    1976 Mahogany

    Default

    Quote Originally Posted by O Vette View Post
    Could someone tell me if 1975 frames came with a two hole cross member for dual exhaust or with one hole cross members for y pipe exhaust. I have been researching this question and don't seem to be able to find a consistent answer. I have seen pictures of '75 frames with two holes in a cross member but, have seen pictures of and looked under some 75's that have y pipes. Could the two hole dual exhaust have been an option or available only on L82 models?
    Your '75 should have 2 holes, as does my '76. Stock exhaust, long gone, had the the Y pipe with 2 holes in the cross member.

  3. #3
    Member White75's Avatar
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    Sep 2007
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    Kingwood (Houston) TX
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    496
    Corvette(s)
    '75 L48 Auto White, '78 L82 4-spd SA

    Default

    Thanks to the catalytic converter, the stock exhaust routes through the passenger side hole only. Didn't matter what if it was an L82 or L48. GM didn't redesign the crossmember so you still have 2 holes. Makes it really easy to retrofit a true dual exhaust to make things breathe easier.

  4. #4
    Member Rod75's Avatar
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    Feb 2011
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    Just that side ofthe MotorCity
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    79
    Corvette(s)
    1975 Modified Coupe

    Default

    Quote Originally Posted by White75 View Post
    Thanks to the catalytic converter, the stock exhaust routes through the passenger side hole only. Didn't matter what if it was an L82 or L48. GM didn't redesign the crossmember so you still have 2 holes. Makes it really easy to retrofit a true dual exhaust to make things breathe easier.
    I agree, with the above.
    I recommend that if you're still running the orig stock cat converter, replace it with a non-stock type. The orig style pellets broke down and caused clogging of the unit.
    Cheers

  5. #5
    Member
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    Mar 2010
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    Upstate NY
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    Corvette(s)
    2004 Black Coupe, 1977 Yellow T-Top

    Default

    Thanks for the information. This folks in this forum are a great help to those of us who need some help.

  6. #6
    Member
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    Nov 2002
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    Delray Beach,Florida
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    59
    Corvette(s)
    2003 Red Z06

    Default

    The above info is correct. I also checked my 1975 dealer brochure and it shows the frame with the two holes for the exhaust pipes.

  7. #7
    Member krscholz's Avatar
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    Oct 2008
    Location
    Caldwell, ID
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    128
    Corvette(s)
    75 Corvette Coupe, 383 Stroker

    Default

    Quote Originally Posted by O Vette View Post
    Could someone tell me if 1975 frames came with a two hole cross member for dual exhaust or with one hole cross members for y pipe exhaust. I have been researching this question and don't seem to be able to find a consistent answer. I have seen pictures of '75 frames with two holes in a cross member but, have seen pictures of and looked under some 75's that have y pipes. Could the two hole dual exhaust have been an option or available only on L82 models?
    Go to Corvette Central and buy their L-82 dual exhaust system with Magnaflow mufflers. Get rid of the Cat and smog pump and finally enjoy a little more power and great sound. I did this a year ago with my 75 and love it.

    Ken

  8. #8
    New Member
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    Oct 2011
    Location
    Iowa, United States
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    6
    Corvette(s)
    1975 Bright Blue Metallic Coupe

    Default

    Quote Originally Posted by krscholz View Post
    Go to Corvette Central and buy their L-82 dual exhaust system with Magnaflow mufflers. Get rid of the Cat and smog pump and finally enjoy a little more power and great sound. I did this a year ago with my 75 and love it.

    Ken
    I just bought my vette and realized it has true duals on it, but it does not sound impressive at all. How would you describe the magnaflow sound? I need to get new exhaust anyway as my pipes are starting to get rusty and it appears one has been replaced already. I want something deeper and throaty without sounding obnoxious. Basically, I want it to sound like a real muscle car!

  9. #9
    Member Whiteshadow89158's Avatar
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    Apr 2008
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    Orange County,CA
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    244
    Corvette(s)
    1981 dark purple coupe

    Default

    Quote Originally Posted by jessa71 View Post
    I just bought my vette and realized it has true duals on it, but it does not sound impressive at all. How would you describe the magnaflow sound? I need to get new exhaust anyway as my pipes are starting to get rusty and it appears one has been replaced already. I want something deeper and throaty without sounding obnoxious. Basically, I want it to sound like a real muscle car!
    You want flowmasters 40 series mufflers then. They have 3 different types, originals with eventually make your ears bleed so you might want to go with either the Delta flow or the regular two chamber.
    "It's not the long haired well fed men i fear, but the pale and deprived"~ Gaius Julius Caesar

  10. #10
    Member Rod75's Avatar
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    Feb 2011
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    Corvette(s)
    1975 Modified Coupe

    Default

    Quote Originally Posted by jessa71 View Post
    I just bought my vette and realized it has true duals on it, but it does not sound impressive at all. How would you describe the magnaflow sound? I need to get new exhaust anyway as my pipes are starting to get rusty and it appears one has been replaced already. I want something deeper and throaty without sounding obnoxious. Basically, I want it to sound like a real muscle car!
    I've seen 'muffler' videos on U-Tube, but it's hard to really tell with a recording. The best place to get a buffet of sound is at a large car show. Get there early as they motor in and find ones you like and talk to the owners.
    Don't forget, there's many variations that will effect the final sound of exhaust.
    Engine type & mods. Combination's of stock exh. manifolds vs. headers, length of headers/collectors. Diameter of exh. pipe, bends, length, crossovers, etc.
    Every muffler is also different in sound, along with combination's of mufflers with resonators added.
    I'm using headers and 2.5" dual exh. with DynoMax Turbos on mine and like 'em. They don't make me deaf just cruising, but roar when the engine does. Don't even know if they make those anymore...

  11. #11
    Member lagnaf's Avatar
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    Dec 2007
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    Kansas
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    Corvette(s)
    1973 pearl white roadster

    Default I want it to sound like a real muscle car!

    it's my understanding that if you go with either Flowmasters or Magnaflows you'll be in good shape. You might also consider looking at chambered mufflers. Look into Cherry Bombs as well.

    I have some chambered mufflers outfitted on my '73. I've got them on 21/2" stainless steel pipes. I'm running a stroker motor with headers and I couldn't be happier with both the performance and the sound of these mufflers. My mufflers are Powerstick chambered mufflers. I'm working on putting a couple of videos on Youtube.
    Drive it like ya stole it!

  12. #12
    Member
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    Apr 2010
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    California
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    111
    Corvette(s)
    1973 Stingray

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    Quote Originally Posted by O Vette View Post
    Could someone tell me if 1975 frames came with a two hole cross member for dual exhaust or with one hole cross members for y pipe exhaust. I have been researching this question and don't seem to be able to find a consistent answer. I have seen pictures of '75 frames with two holes in a cross member but, have seen pictures of and looked under some 75's that have y pipes. Could the two hole dual exhaust have been an option or available only on L82 models?

    Do you have any hot rod shops or a local muffler shop with experience? Check out "corvette with thump" on youtube. My video sounds just like my car. I have flowmasters.

  13. #13
    Member bagger's Avatar
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    Jun 2005
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    wabashu
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    Default

    I did what Krscholz advised for my 79 and am quite happy with the sound and the performance I got out of the system.

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