Yup, stock speedo is optimistic by about +10%. I was so disappointed when calibrating my Trailtech Vapour gauge to find out that my previous 100mph speed was really only 91mph.
With tow down straight @ Laguna Seca or Thunderhill, I’ve hit real 110mph (121 on stock speedo)@ 13K-RPMs. I have about +20-25% more power and than stock.
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