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xr-1 headers

  1. High Flow cats with Borla XR-1 headers

    Dodge Challenger R/T Specific
    Has anyone found a way to run high flow cats with the XR-1 long tubes? I am running these with the ATAK catback and love it most of the time. But I noticed I have lost 6 mpg with the catless mids. I don't mind cause you don't get power with out using more go-go juice. But running at 2000 rpms at...