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ITR JDM 4-1 Header on AUS ITR

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    ITR JDM 4-1 Header on AUS ITR

    hi,
    I need an opinion on putting JDM itr 4-1 headers onto an australian ITR? Would anyone advise of this upgrade?

    thanks

    #2
    Yes..its a good upgrade. Go for it.

    Comment


      #3
      ok thanks, i'll do that,
      4-1 has higher range power right?

      Comment


        #4
        ppl say you lose bottom end
        but i didnt feel that i lost anything
        the only problem is they hang very low
        i scrap all over the place and im not even that low

        Comment


          #5
          my cars not lowered so that wont be an issue. would i have much trouble fitting the headers onto the current stock exhaust? is there anything i need to also get with it in order to make it fit?

          Comment


            #6
            yeah. the stock cat or audm is 2.25 inch. the header is 2.5 inch. So in other words, you have to either get a new cat or get a 2.5 flange to weld into the cat.

            I wanted to get a 4-1 jdm header too, but i foung a spoon 4-2-1 header selling at $450. So i bought the spoon header. I am also going to do some custom work on the pipings and de-cat at the same time. But leaving the stock exhaust on.

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              #7
              Originally posted by Vincikwan View Post
              Yes..its a good upgrade. Go for it.
              But only with a test pipe/metal catalytic converter and a 2.5 inch catback.

              What kind of exhaust system has a AUDM ITR?

              In germany,we have the small one with about ~1.8 inch diameter, header also.
              sigpic

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                #8
                ITR with 1.8 inch? U serious?

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                  #9
                  ^^ yessur

                  About 1.8 inch diameter.
                  I search a pic of the EUDM exhaust system and post it here.
                  sigpic

                  Comment


                    #10
                    Originally posted by ITR#2313 View Post
                    But only with a test pipe/metal catalytic converter and a 2.5 inch catback.

                    What kind of exhaust system has a AUDM ITR?

                    In germany,we have the small one with about ~1.8 inch diameter, header also.
                    I think it wont be much of a difference considering that the german made is of a 1.8", but i think there will be some minor gains with the AUS ITR as it has a 2.25" exhuast. am i right?

                    Comment


                      #11
                      Yeah, aus dc2r has 2.25 inch 4-2-1 extractor. Jdm has 2.5 inch 4-1 extractor.

                      Based on a book i read with dyno proven results, the 4-1 jdm is heaps better than the 4-2-1 audm extractor. Bottom end is the same but high rpm the 4-1 is better. So the 4-1 jdm extractor does not lose bottom end. Dyno proven

                      Comment


                        #12
                        dont forget with the stock itr exhaust there is a bottle kneck right after the cat,
                        it goes down to about 2inch so maybe get an exhaust shop to chop it and weld 2.25
                        piping, otherwise just get a full custom 2.5 cat back
                        depends what you want and how far your budget can be stretched
                        Regards

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                          #13
                          yup, that will be done as well.

                          Comment


                            #14
                            your laughing then =]

                            Comment


                              #15
                              Laughing at?

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