Not real sure there f5. I had the smaller 31's when I bought it and got the 33's as a upgrade. They hooked up there ------ told me my speedo was now caled for the 33's. I suppose it was just a plug in off there equipment. I wasnt standing there watching them. My dealer told me I should get the speedometer reclabrated so I did. I hope I didnt get shanked 50$ for nothing.
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