Hi Andy, The Mopar book "B/RB Engines" Reccomended the Stage VI above all others, esp. street and strip (what they call dual purpose) Any elaboration why? They cite casting quality, Aluminum hardness and airflow. The book states that there is a trade off in horsepower and torque, but their Stage VI is the optimum in torque due to the numbers it flows, at what RMP it flows.