Put a superchips in my 05 DMAX last night and power is great. Seems pretty comparable to all other chips that I have used. anyways it had an option to remove top speed limiter and I checked it but still nothing over 97. what gives?

hypertech and superchips from what I have read are one of the only ones that don't do that. (or doesn't know how) Bullydog and Predator can do it.

do a search in the Power and Performance Upgrades section and you will find what I found.