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stock exhaust 1 1/4" tubing diameter

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  • stock exhaust 1 1/4" tubing diameter

    Looking at fabricating an exhaust for my 2004 Road Star and wanted to know what diameter tubing the factory used, just as a baseline. I was able to confirm with a caliper that the actual working part of the exhaust is made of 1 1/4" diameter (OD) tubing and the rest of the girth is all made up of heat shielding. I titled this post as I did so it can hopefully be found with a search. This is interesting because for a 102 cu. in. engine, this is really tiny exhaust tubing.

  • #2
    This is why we use aftermarket pipes that are 1 3/4" in diameter.

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    • #3
      Smaller diameter tubes help to make for better torque. The larger diameter takes it the other way, and can allow for the production of more HP.

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