its not illegal to do alot of things to your car... installing a switch in line with the speedo is a modification.. the problem comes if you sell the car and claim on the title that it is actual mileage shown (when in fact its not) that or you knowingly cut that wire because you did not want to exceed a certain mileage for warranty coverage reasons.. all that stuff is illegal... so the bottom line is.. dont screw someone else with the stuff you do to your car and your fineThe go-baby-go mod would prevent your odo from racking on miles, and would be a federal crime. The URD speed unlimiter isn't illegal, although breaking the speed limit still is (disclaimer)
in a 4x4 that I assume is either stock suspension or lifted then you'll have safety issues. Not to mention offroad tires arn't rated for speed or handeling at speed. 110mph in a high truck is a LOT.i want one but...will it be worth on the 4x4 models? i was at 4000rpms i think, in the picture.