Hey, You need a power programmer. It'll allow you to adjust the size of tires and gear ratio. It will also change the shift points, so you don't jump in and out of gear, as much.
You will notice a decrease in rpm due to larger tires.
A gear swap will help that.. I run 1500rpm @ 50mph. 38" tires.
Looking to swap gears all I can find is 4:56.
Good Luck
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