Muffler question- flowmaster vs. ?

Mopar Exhaust Systems

  1. Car Nut

    Car Nut Mopar Master

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    Anyone use the Borla XR-1 Racing Mufflers?
     
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    • BigBlockMopar

      BigBlockMopar BigBlockMember

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      I run the Borla Pro-ST (street) mufflers.
       
    • Mattax

      Mattax Just the facts, ma'am FABO Gold Member

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      FWIW Pipemax calculations I've done show for a typical 340 puts the best locations for H pipe or X at 20, 40, 82" after the end of the primaries.
      Plus minus an inch or two isn't going to matter. The hamonic calculations only change slightly for different cams and compressions, at least within the street/strip type uses.
      Worst placements will be around 31, and 61".
       
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      • 66jim

        66jim Well-Known Member

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      • gold66cuda

        gold66cuda Well-Known Member

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        I do, I'm told they sound a lot different than most other mufflers out there, I'm never behind it. They are well built, I've run them for about 20 years, still look like new.
         
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        • Car Nut

          Car Nut Mopar Master

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          Can you post a video, I would like to hear how they sound.
           
        • DentalDart

          DentalDart Well-Known Member

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          Sorry for resurrecting this thread but this sounds freaking amazing! Info in car and exhaust please :thumbsup:
           
        • mopowers

          mopowers Well-Known Member

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          Just a mild 340 - 9.6 SCR, RHS heads, hydraulic flat tappet 231 @ .050" .561" w/ 1.6's 108 LSA, Dougs headers w/ 2.5" pipes - no cross over.
           
        • BigBlockMopar

          BigBlockMopar BigBlockMember

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          Just noticing this reply.
          Will try to shoot some video.
           
        • Dartsun

          Dartsun Member

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          Here’s a little video of my XR1 on 2” exhaust from manifolds on my 273.
           
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