exhausts

  1. Busa4Fun

    Stock header modification

    Hello guys hope you're good, there are some udpates after i modded my stock header to 4-2-1. Before, i just modded the diameter of the end pipe (60mm). Now, i modded the secondary tubes to 50 mm but i did not mod the primary tubes they are Still stock size (38mm) should i mod them too ?
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