magnum manifolds

Mopar Exhaust Systems

  1. 93ragtop

    93ragtop Well-Known Member

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    I have a set of manifolds off of a 2000 ram 5.9. The opening is 2in. The motor is a stock 2000 5.9 other then a carb conversion.....
    Reading on this site, dual 2.5 in. exhaust seems to be the recommended size.
    My question is, are most of you converting the 2in to 2.5in at the manifold?
    If so, is there much being accomplished with the 2.5 in. exhaust?
    Assuming there is, how restrictive would it be to run about 2 ft of 2in pipe, then upsize to the 2.5?
    It's going in a 87 4wd dakota, and space for the 2.5 is tight.
    Thanks for your opinions.
     
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    • Garrett Ellison

      Garrett Ellison Amateur driver on public roadway, do not imitate.. FABO Gold Member

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      There were two sizes of spigot outlets on magnum manifolds. The early was 2-1/8 and the later was 1-7/8. The common modification concerning magnum manifolds (with an a body anyway) is using a right hand manifold and boring the 2-1/8 outlet to 2-1/4 inches. I’m a little fuzzy on the stock exhaust pipe size for which manifolds at the moment, but I’m pretty sure that the modified early manifold makes use of a 2-1/4 inch pipe and the later manifold uses 2 inch pipe stock.
       
      Last edited: Oct 18, 2020 at 8:27 AM
    • Treblig

      Treblig Well-Known Member

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      Would you mind posting good pics of the 2000 Ram 5.9 exhaust manifolds, with measurements of the outlet? Please include pics of the casting number. I try to keep track of the larger manifolds and have never seen a 2 inch outlet 2000 manifold. I'm sure they exist, I've just never seen one. Thanks
       
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      • Hellrats

        Hellrats Just another dumbass FABO Gold Member

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        This is what I did on one of my "A" body cars because headers can be a pain in the a$$ on a street car. 2" just enough to get past the steering then it necks up to 2.5" the rest of the way back. I'm running 318 manifolds that were opened up as much as possible. Runs great too!
         
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        • 93ragtop

          93ragtop Well-Known Member

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          Mine are the smaller ones.... I thought the only larger ones were on 92-93 magnums. 94 forward were all the same both 5.2 & 5.9.
          I guess my post is a little misleading. They are the 1&7/8? But I think the pipe measures 2in. OD
          Below are pictures. Oh, and for the same reason, wanting manifolds..... Headers for the early Dakota 4wd only seem to be shortys and they come with the flange to hook up to the stock y pipe.
          Thanks to everyone, and here are the pictures.

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          • Treblig

            Treblig Well-Known Member

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            Yep, those look like van/truck manifolds. The passenger's side will work on an A body but because of the design the passenger's side exits close to the fire wall/foot board. They'll work just fine. Don't know about the driver's side but I think other FBAO member's have made minor mods on the driver's side to make them work. The biggest (2 1/8") manifolds were made in 92/93 but then in 96/97/98 they were also used on the Jeep Grand Cherokee. Unfortunately the driver's side off of the JGC won't work on an A body but the passenger's side fits better than then factory manifolds!! The larger 2 1/8" manifolds were also used on some trucks and vans but aren't as popular (design differences) as the JGC manifolds. You can buy a JGC 2 1/8 manifold for 25-45 bucks!!
             
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            • Stephen Hotz

              Stephen Hotz FABO Gold Member FABO Gold Member

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              Passenger side truck manifold made contact with my transmission dipstick handle otherwise it fit as stated.
               
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