Congrats on your truck. I have a rcsb sport 5.7 and yes it is fast! Top end is governed at 115 but it will get up there real quick. Add a better flowing exhaust and cold air intake kit and probably make it even better. I have 9k miles on mine now and it will get around 20mpg highway if I keep it under 70. Don't try to take me off the line unless you have a very fast car!
Jim in Waco.