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exhaust

Discussion in 'The Garage' started by CenTxk5blazer, Aug 18, 2003.

  1. CenTxk5blazer

    CenTxk5blazer Registered Member

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    I know i saw this some where on the board when I did a search but I can't find it again.
    Anyways, Gm necked there exhaust from a 3" to a 2.25" or 2.5" right?
     
  2. CenTxk5blazer

    CenTxk5blazer Registered Member

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    what, no body has anything to say about this?
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    It's kind of a generic question. What years? What models? Where on the vehicle?

    No exhaust manifold outlet on our trucks was larger than about 2.5".
     
  4. CenTxk5blazer

    CenTxk5blazer Registered Member

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    Sorry, in particular my 84' /forums/images/graemlins/k5.gif. I thought that I read on here that at the manifold it was 3" and continued to the cat but on the other side of the cat it was 2.5"/2.25". Is this true?
     
  5. SUBFAN

    SUBFAN 1/2 ton status

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    Often from the 'y' pipe to the front of the cat. is 3.0".
     
  6. jarheadk5

    jarheadk5 1/2 ton status

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    Interesting...
    The Y-pipe on my '87 TBI 305 with factory cat is 2.5". The cat is 2.5" in/out.
     
  7. funkycold

    funkycold 1/2 ton status

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    I have 3" on both sides of the cat in my '89 /forums/images/graemlins/burb.gif
     

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