- dual manifold or header
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    1. Junior Member
      Join Date
      Nov 25th, 2019
      Calera, AL
      11-27-2019 12:37 PM #1
      I'm looking to upgrade my exhaust. I'm wondering if I should go with a raceland header or dual outlet manifold with TT down tubes. I'm going 2.25 exhaust with borla xr1. muffler.

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    3. 11-27-2019 03:08 PM #2
      what car/engine do you have?

    4. 11-27-2019 03:09 PM #3
      iv'e never been that good at guessing cars by the exhaust manifold alone

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    6. Junior Member
      Join Date
      Nov 25th, 2019
      Calera, AL
      11-27-2019 11:17 PM #4
      oops I guess that would help. 85 mk2 golf 1.8

    7. 11-28-2019 08:59 AM #5
      It was my understanding that the factory exhaust manifold is pretty good. Spend some time port matching and you should be fine. There are some good header manufacturers but I have always had issues with headers. Either they leak, crack, fit poorly, or something similar.

      I made an exhaust system for my wife's 91 Cabriolet. I found an older Mk1 dual port manifold and ported it. I made a 1 7/8" dual long tube head pipe and 2.25" all the way back. I made the resonator and muffler too. It sounds pretty good.

    8. 11-28-2019 11:33 AM #6
      the standard manifold is not the best design, but it doesn't seem to be that restrictive. should be good for 150/160 bhp.

    9. 11-29-2019 10:27 AM #7
      The factory single outlet is not very good but the dual outlet are suppose to be good. I have no proof of that, just what I heard. Certainly good for the 150hp you posted but I doubt if there are any that produce that and still be streetable.

    10. Junior Member
      Join Date
      Nov 25th, 2019
      Calera, AL
      11-29-2019 01:30 PM #8
      thank Butcher. I haven't really thought about it, but your right. Can't say I've ever had headers that i wasn't changing gaskets on or tightening header bolts. I was just thinking about flow. If the dual outlet manifold with TT down tubes flows as good or better than cheap headers.

    11. 11-30-2019 08:33 AM #9

      This picture shows a stock Mk1 manifold and one that was ported. Porting cast iron is not a fun task. The metal shavings get everywhere and most seem to find a way under the skin. Wearing gloves helps but one they get between the glove and hand, it's even worst.

      The dual 1 7/8" down pipe.

      The final product.

      Not certain it's better than a header, but I'm certain it's better than stock.
      Last edited by Butcher; 11-30-2019 at 08:35 AM.

    12. 12-01-2019 02:21 PM #10
      nice fabbing there

    13. 12-01-2019 05:52 PM #11
      Pain the the rear holding the pipe and tack welding it in place. You can see spots that I just missed. I tig welded them once I got the pipe out of the engine compartment.

      My first time and it went well. Learned a lot.

      This is my downpipe for the turbo. Separate wastegate exhaust.

    14. 12-03-2019 09:33 PM #12
      The TT route will last much longer. My 16V Scirocco pull 150 on a dynojet with a TT pipe and exhaust. It is a 4-2-1 setup straight from the factory.
      Wally, that downpipe is swell

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