I hit 105 and that's all she wrote. Tack stays at 2500 RPM. I know that the Superchips Flashpaq 3808 doesn't de-activate the speed limiter. Got there pretty damn quick but stayed there.
Turn the key forward after you hit 100mph (like trying to start the engine), gauges will reset and you will speed up. It worked on all my other computer trucks, (ford and dodge). Hope it works on the 6.7L