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RE: Exhaust / Quick Question

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  • RE: Exhaust / Quick Question

    Hi Guys,

    As the title suggests I have a quick question in regards to the Exhaust / Cat / Dump Pipe of MK4 GTI's 1.8L Turbo.

    - Is the standard dump pipe off the turbo (where the four bolts are) Mild Steel / Stainless Steel or Cast?

    - When people upgrade the exhaust system, do you also change the factory Cat? (I have been told that these Cats are Euro 4 and can not be replaced by just a standard performance high flow cat.) or do you not use a Cat altogether? (Is there legal issues with that???)

    Any help would be great!

    Glenn
    MY18 VW Passat Alltrack Wolfsburg Edition + Panoramic Sunroof + some extra goodies... (Pure White)
    MY17 ŠKODA Superb 206TSI 4x4 + Sunroof + Tech Pack + Comfort Pack + some extra goodies... (Moon White)

  • #2
    The dump pipes are cast and you must run a CAT of some sort. Cops are catching on to gutted cats these days with infra red heat guns. They will get a reading from the inlet and outlet of the cat and if theres no difference in temp, you get reamed.

    Comment


    • #3
      Originally posted by FknDubbin View Post
      The dump pipes are cast and you must run a CAT of some sort. Cops are catching on to gutted cats these days with infra red heat guns. They will get a reading from the inlet and outlet of the cat and if theres no difference in temp, you get reamed.
      $20,000 fine from the EPA if you get caught too!

      Comment


      • #4
        JC! Thats a bit steep! That'd get me a K04 upgrade and all the bits and bobs plus more and I'd probably be putting out more emmisions anyway
        Originally posted by Whubbsie
        There is nothing better than a polo badge, thats why you will notice Veyron drivers with polo gti badges.... they know where the true sizzles at!

        Comment


        • #5
          Thanks for the quick reply guys!
          MY18 VW Passat Alltrack Wolfsburg Edition + Panoramic Sunroof + some extra goodies... (Pure White)
          MY17 ŠKODA Superb 206TSI 4x4 + Sunroof + Tech Pack + Comfort Pack + some extra goodies... (Moon White)

          Comment


          • #6
            Originally posted by ope126 View Post
            Thanks for the quick reply guys!
            i have apr dp 2.5" its sweet make sure you get a rhd dp no a cheap **** one from ebay
            mk4 the mods begin for round 2 hahahha

            Comment


            • #7
              i also have a 2.5" and hi flow cat...no probs

              MK4 GTI|REVO|4BAR ADJ FPR|APR FMIC|APR R1 DV|TURBO INLET PIPE|KONI|WHITELINE|CUSTOM CAI + K&N|2.5" TB + HI FLOW CAT| ECS DOGBONE

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              • #8
                Originally posted by DUB 20V View Post
                i have apr dp 2.5" its sweet make sure you get a rhd dp no a cheap **** one from ebay

                I am also looking to do a 2.5" dump pipe. However at this stage I am looking to get it custom made!
                MY18 VW Passat Alltrack Wolfsburg Edition + Panoramic Sunroof + some extra goodies... (Pure White)
                MY17 ŠKODA Superb 206TSI 4x4 + Sunroof + Tech Pack + Comfort Pack + some extra goodies... (Moon White)

                Comment


                • #9
                  What are the cops like towards butterfly valves like the varex ?
                  Audi B4 80 Q V6'94 Race Car !! KEGGED
                  Audi B4 80 V6 Avant'94 Only one in the country that I know of !!! KEGGED
                  Subaru Forester XT'06 Genome Exhaust/Car-PC/Boost Gauge/Oettingers !
                  --VW Bora V6 4mo'01 Gone

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                  • #10
                    What they cant find, they cant shaft you for. You just have to be smart about what you do.

                    Comment


                    • #11
                      Originally posted by qsilverza View Post
                      What are the cops like towards butterfly valves like the varex ?
                      Aslong as it goes through the cat they'll only bother you about the sound - No big deal.

                      Comment


                      • #12
                        So if you installed a downpipe without the cat, would it throw off codes?
                        Or just as long as both the O2 sensors are put back in the pipe work all should be OK?
                        MY18 VW Passat Alltrack Wolfsburg Edition + Panoramic Sunroof + some extra goodies... (Pure White)
                        MY17 ŠKODA Superb 206TSI 4x4 + Sunroof + Tech Pack + Comfort Pack + some extra goodies... (Moon White)

                        Comment


                        • #13
                          How much extra power does smashing the insides of the cat out give you? I did it in my last commodore VN (bucket or s@#t mind you). Toxic stuff!
                          ---/=========\
                          (]/_ O _____ O _\[)
                          "'(O8o)=\X/=(o8O)
                          '|\===------===/|
                          [__|========|__]

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                          • #14
                            Originally posted by ope126 View Post
                            So if you installed a downpipe without the cat, would it throw off codes?
                            Or just as long as both the O2 sensors are put back in the pipe work all should be OK?
                            It can do, the 2 probes are there for a reason. Some tuners can write the 2nd probe out of the code so the ECU doesn't know it should monitor it.

                            Gavin
                            optimumcode@gmail.com | https://www.vwwatercooled.com.au/for...i-;-79012.html | https://www.facebook.com/TTY-Euro-107982291992533

                            Comment


                            • #15
                              Now I have a dilema...

                              I have just purchased the following 2.5" stainless dump pipe from www.meganracing.com



                              But it appears to be one peice and looks to have a resonator but no cat.
                              It has two positions for the 02 sensors, and the one in the resonator seems to be raised. Does this assist in not making the CEL Codes appear? I have heared that because it is at a different position, it get less air and keeps everything in check, so no codes. Any thoughts...

                              Or should I just get it attached to the existing Cat to save any future isses?

                              Glenn
                              Last edited by ope126; 25-10-2007, 06:22 PM.
                              MY18 VW Passat Alltrack Wolfsburg Edition + Panoramic Sunroof + some extra goodies... (Pure White)
                              MY17 ŠKODA Superb 206TSI 4x4 + Sunroof + Tech Pack + Comfort Pack + some extra goodies... (Moon White)

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