Not quite, sorry if it wasn't clear.
Induction kit = more induction sound, likely small gain in top end power but at the cost of low end torque. (general for all indication kits on most cars I believe)
Drop in high flow filter = small gain in power without loss of low end torque. Can be cleaned rather than binned at service time.
Velocity stack = modification to airbox to improve smoothness of airflow. Fitted as standard to later model 350s but can be retro fitted. Should help pick up a little extra power but again, not much.
Hope that helps