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    Aftermarket exhaust on stock engine

    Exhaust
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    • TBthegr81
      TBthegr81 last edited by

      I am looking at a Athena front pipe exhaust, but wondering if it does anything for me with the rest of the engine stock? And would I need to combine it with a new muffler to get anything?

      My org front pipe has some damage from being laid down by previous owners, so if there is no downside I could make it look nice at the same time with a new pipe.
      If, however, it performs worse than stock if I don't also combine it with bigger carbs, porting or big bore then I need to think about it.

      DTR 125 R -89

      Calum markus.w 2 Replies Last reply Reply Quote 0
      • Calum
        Calum @TBthegr81 last edited by

        @tbthegr81 Hello,

        Definitely do your research on what pipe you go for.

        I can't speak for Athena's pipe specifically, but the DEP pipe made a huge difference to my DTRE stock engine. The weight difference alone is impressive.

        But yes, a stock pipe can make a difference. The thing is, with the later RE engines, they had a huge honeycombe catalyst system in the expansion chamber. The earlier models didn't have this restriction. Assuming of course it is the correct pipe for the year.

        Always Originate, Never Pirate!

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        • markus.w
          markus.w @TBthegr81 last edited by

          @tbthegr81 change it mate it's not going to do any harm. Obviously allow it to breathe a bit better with a performance exhaust. Next step maybe go up one on the main jet and a performance air filter but not necessary. The 89 model has a restriction in the exhaust in the form of a small washer/collar in the header fixed with 2 spot welds though after all these years and I presume many owners it's probably been removed by now. I highly recommend the dep exhaust. You need to be doing some serious tuning/porting work to justify a bigger carb.

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