1. garry inglis
    9th September 2019 @ 6:13 pm

    well they changed the design on v4 bgm and its crap so who designed this version not mb

    • Philipp
      30th September 2019 @ 1:04 pm

      if you search for the bgm big box here, you will find a comprehensive test of all versions of this exhaust. so you can compare the power graphs, you won’t notice any big differences between the four versions. the overall build quality and relaibilty has been much improved though. and the noise level was heavily reduced with the development of the v4.

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