2016 Colorado Performance?

Looking to mod the Colorado. Turning it into a race truck. Going to be lowering it along with adding a supercharger down the road. What tuners are the best that can remove the speedlimiter. I have H rated tires already and noticed the trucks speed is limited to 98mph. It costs $300 at the tuner to remove the speed limiter. There’s trifecta tunes but you can’t remove the limiter and limited options. Diablo has mixed reviews and flashpaq has a F5 tuner refurbished for $240. Also any mods for the bottom end? Anyone build racing transmissions. I wanna overhaul the 3.6l. (2016 Colorado 3.6l LT)