Welcome Captain beatle. Tuneboy is a definitive improvement on pre-R3T adaptions; if more umph is your desire. I've not heard many accolades about the low grunt R3T and Tuneboy.
 
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I would think that if you are cruising down the highway at the Rocket's "comfortable" speed, I don't think the error will make much difference. If you are pulled over it will probably be because you were doing well over the speed limit and you'll just have to eat the ticket.

Dennis

25 dtg Dubai
26 dtg Home
 
A Tuneboy will actually reprogram the ECU to correctly calculate your speed.

A small improvement can be made with a slightly larger darkside tire. A 225/55 will bring the speedo about 1-2 mph closer to actual.
 
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