necking down after collecter?

Mopar Exhaust Systems

  1. Blind Squirrel

    Blind Squirrel Well-Known Member

    Messages:
    727
    Likes Received:
    526
    Joined:
    Oct 1, 2015
    Location:
    Pacific NW
    Local Time:
    12:01 AM


    Go to about the 3:14 time frame. Recognized industry standard
     
  2. 70DusterBob

    70DusterBob Well-Known Member

    Messages:
    567
    Likes Received:
    126
    Joined:
    Feb 20, 2016
    Location:
    Texas
    Local Time:
    12:01 AM

    Like these:

    Schoenfeld Headers 4122BVSH-3
     
  3. mbaird

    mbaird mbaird FABO Gold Member

    Messages:
    5,905
    Likes Received:
    2800
    Joined:
    Dec 10, 2005
    Location:
    boise, Id
    Local Time:
    11:01 PM
    I have often wondered about the exhaust cooling and condensing as it travels back .
    But I think 2” is a bit too small. I considered going to 2.5 .
     
  4. Treblig

    Treblig Well-Known Member

    Messages:
    5,923
    Likes Received:
    3150
    Joined:
    Oct 5, 2013
    Location:
    South Texas
    Local Time:
    12:01 AM
    Doubling the pipe diameter quadruples the volume/flow!!!! Treblig..."The Science Guy"!!!
     
    • Like Like x 1
    • Agree Agree x 1
    • 70DusterBob

      70DusterBob Well-Known Member

      Messages:
      567
      Likes Received:
      126
      Joined:
      Feb 20, 2016
      Location:
      Texas
      Local Time:
      12:01 AM
      I'm headed for bed. Thank you so much for confirming my concern... I will have a good talk with him in the am.
       
      • Like Like x 1
      • AJ/FormS

        AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

        Messages:
        17,983
        Likes Received:
        6305
        Joined:
        Jan 19, 2014
        Location:
        South-Central Manitoba,Canada, 900ftelevation
        Local Time:
        12:01 AM
        Not the popular opinion, but I don't think there is such a thing as too big in that distance from the merge to the mufflers. One 3" pipe is similar in area to two of 2"pipes, but 2 of 2" pipes has ~33% more pipe skin... so if you installed a PAIR of 2s on each side, you'd end up with a lot pipeskin,er radiating area, and your muffler would not have to work so hard. lol. But I'd run about a foot and a half of merge-sized pipes first.So then.............
        xxxxxxxxxxxxxx xxxxxxxxxxxxx xxxxxxxxxx
        My 367 is running dual 3s just for those reasons. and that lil bugger went 93 in the Eighth. At 3467pounds at 900ft elevation, with a 230@.050cam, reving at 7000.
         
        • Agree Agree x 1
        • Fisher

          Fisher Old Guy with a Cool car.

          Messages:
          1,882
          Likes Received:
          841
          Joined:
          Jul 22, 2012
          Location:
          Regina Sask Canada
          Local Time:
          12:01 AM
          This is the guy you want doing your exhaust, another member on here has had work done by him on his duster.

          Rowdy Flanagan's Muffler Shop

          2850 fm1980
          Marble Falls, Tx 78654
          IN-HOUSE MANDREL BENDING
           
        • Fisher

          Fisher Old Guy with a Cool car.

          Messages:
          1,882
          Likes Received:
          841
          Joined:
          Jul 22, 2012
          Location:
          Regina Sask Canada
          Local Time:
          12:01 AM
        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

          Messages:
          37,765
          Likes Received:
          9464
          Joined:
          Jun 21, 2005
          Location:
          New York, on a Island
          Local Time:
          1:01 AM
          Never heard of headers from TCI.
           
        • MOPAROFFICIAL

          MOPAROFFICIAL Well-Known Member

          Messages:
          5,437
          Likes Received:
          4419
          Joined:
          Jun 1, 2016
          Location:
          Beach
          Local Time:
          10:01 PM
          Buy the jegs 3" kit , wAy better...and use dynomax ultra flow mufflers.
           
          • Like Like x 2
          • Fisher

            Fisher Old Guy with a Cool car.

            Messages:
            1,882
            Likes Received:
            841
            Joined:
            Jul 22, 2012
            Location:
            Regina Sask Canada
            Local Time:
            12:01 AM
            I have 3" TTI mandrel bent X pipe kit with TTI headers Hooker mufflers and dumps.
             
          • Fisher

            Fisher Old Guy with a Cool car.

            Messages:
            1,882
            Likes Received:
            841
            Joined:
            Jul 22, 2012
            Location:
            Regina Sask Canada
            Local Time:
            12:01 AM
            upload_2019-12-6_1-3-39.png
             
            • Like Like x 3
            • Dfr360cuda

              Dfr360cuda MAGA Again

              Messages:
              1,352
              Likes Received:
              768
              Joined:
              Aug 30, 2012
              Location:
              Finleyville, pa
              Local Time:
              1:01 AM
              I think 2 inch is to make it easier for him to bend and tweak around driveshaft and cross members. Better ground clearance too. I'd get a 3 inch aftermarket system that's had all the bugs worked out and do it yourself. Also Jegs and Summit price match.
               
              • Agree Agree x 2
              • Like Like x 1
              • Kendog 170

                Kendog 170 Let the boy go !

                Messages:
                831
                Likes Received:
                517
                Joined:
                Mar 10, 2016
                Location:
                Tewksbury Ma.
                Local Time:
                1:01 AM
                I could see 3" to muffler then 2 1/2" out the back but no way 2" after the header.
                 
                • Agree Agree x 2
                • Like Like x 1
                • 66jim

                  66jim Well-Known Member

                  Messages:
                  468
                  Likes Received:
                  436
                  Joined:
                  Dec 11, 2007
                  Location:
                  NE PA ie pennsyltucky
                  Local Time:
                  1:01 AM
                  Decide the pipe diameter layout YOU want not the easiest option for them they are being LAZY.
                   
                  • Agree Agree x 1
                  • famous bob

                    famous bob mopar misfit FABO Gold Member

                    Messages:
                    16,123
                    Likes Received:
                    6042
                    Joined:
                    Aug 14, 2011
                    Location:
                    okla
                    Local Time:
                    12:01 AM
                    Dam sure wouldn`t do it to mine !!
                     
                    • Agree Agree x 3
                    • rumblefish360

                      rumblefish360 So close, yet so far away FABO Gold Member

                      Messages:
                      37,765
                      Likes Received:
                      9464
                      Joined:
                      Jun 21, 2005
                      Location:
                      New York, on a Island
                      Local Time:
                      1:01 AM
                      I’d even feel guilty doing to someone I did not like much.
                       
                      • Like Like x 1
                      • Agree Agree x 1
                      • toolmanmike

                        toolmanmike FABO MODERATOR Staff Member FABO Gold Member

                        Messages:
                        48,368
                        Likes Received:
                        33000
                        Joined:
                        Jan 18, 2006
                        Location:
                        Iowa
                        Local Time:
                        12:01 AM
                        Plus a 10' stick of 2" pipe cost him a few bucks. Huge profit in 2" exhaust. Go at least 2 1/2" Stoker could use 3" with 2 1/2" tail pipes. With all the nice exhaust kits out there now days, why go with a crudely bent set up from a exhaust shop.
                         
                      • thesiren74

                        thesiren74 Well-Known Member

                        Messages:
                        1,178
                        Likes Received:
                        726
                        Joined:
                        Feb 23, 2014
                        Location:
                        kenosha,wi
                        Local Time:
                        12:01 AM
                        Why even have headers if the exhaust is that small.
                         
                        • Agree Agree x 2
                        • Like Like x 1
                        • 70DusterBob

                          70DusterBob Well-Known Member

                          Messages:
                          567
                          Likes Received:
                          126
                          Joined:
                          Feb 20, 2016
                          Location:
                          Texas
                          Local Time:
                          12:01 AM
                          The shop is an all around mechanic shop, not an exhaust only shop. I kindly mentioned it to him today and the "TTI" not "TCI" headers came with 3/8" flanges for the extensions/collectors to mate up with a gasket between. So I got him to cut a 3" pipe and weld it to the flange that would have held the 3" to 2" extensions/collectors. The inlet side of the extension/collector is 3" then it tapered down to 2". I think ya'll are right, he may have been trying to save time/cut a corner on it, but I got it straight with him so it will be 3" all the way... Thanks for all of your input.

                          I have dyslexia, that is how I got "TCI" and "TTI" mixed up. Oops! They are TTI 3 step headers, very nice ones. About $800 if I remember right. That is why red flags went flying when I saw that 2" section on there.
                           
                        • 70DusterBob

                          70DusterBob Well-Known Member

                          Messages:
                          567
                          Likes Received:
                          126
                          Joined:
                          Feb 20, 2016
                          Location:
                          Texas
                          Local Time:
                          12:01 AM
                          Your right, TTI. Sorry, I'm dyslexic.
                           
                        • 70DusterBob

                          70DusterBob Well-Known Member

                          Messages:
                          567
                          Likes Received:
                          126
                          Joined:
                          Feb 20, 2016
                          Location:
                          Texas
                          Local Time:
                          12:01 AM
                          Rowdy is 106 miles away from me. While I could tow it there, I will have to wait until they are needed again. There is no exhaust on it, the motor and trans are brand new, can't drive with open headers, but yeah, someone told me about Rowdy before. I talked to him and he was very intelligent, priced right, and does great work. Just a bit far for the build this time around, but the next time I need exhaust work, I'm drivin' to him, even if I need it towed!
                           
                        • 70DusterBob

                          70DusterBob Well-Known Member

                          Messages:
                          567
                          Likes Received:
                          126
                          Joined:
                          Feb 20, 2016
                          Location:
                          Texas
                          Local Time:
                          12:01 AM
                          Thanks AJ, I do plan on givin' 'er a run at the track to see what my numbers are, I will post them, but it will probably be spring before I can. Please read above posts for the latest.
                           
                        • Blind Squirrel

                          Blind Squirrel Well-Known Member

                          Messages:
                          727
                          Likes Received:
                          526
                          Joined:
                          Oct 1, 2015
                          Location:
                          Pacific NW
                          Local Time:
                          12:01 AM
                          Sorry but a small point of contention. Dyslexia is where you mix letters up from within the word. Changing letters and making up your own stuff is called being a democrat.
                           
                          • Like Like x 5
                          • Agree Agree x 1
                          • 70DusterBob

                            70DusterBob Well-Known Member

                            Messages:
                            567
                            Likes Received:
                            126
                            Joined:
                            Feb 20, 2016
                            Location:
                            Texas
                            Local Time:
                            12:01 AM
                            Lol!
                             
                          • Ccas

                            Ccas FABO Vendor FABO Vendor

                            Messages:
                            191
                            Likes Received:
                            137
                            Joined:
                            Dec 7, 2016
                            Location:
                            Hatfield, PA
                            Local Time:
                            1:01 AM
                            Both Summit and Jegs have the Pypes 3" to 3" and 3" to 2.5" collectors. 304 stainless, tig welded. Reasonable price. I see no possible explanation for necking down to 2" and even less reason to open back up to 3". Once you've necked down for more than 6-8", it's like putting a cork on the exhaust.

                            We've done countless dyno tests. If you have nice TTI headers and 500hp, we would recommend a 3" to 3" collector, 3" X pipe, 3" mufflers and 2.5" tailpipes. All mandrel bent which is a MAJOR factor in choosing this consideration. If a local shop, did this same configuration, you'd lose 30-50hp. :(
                             
                            Last edited: Dec 6, 2019
                            • Like Like x 1
                            1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                              By continuing to use this site, you are consenting to our use of cookies.