I've had all 3 boxes. OEM, fast ratio and finally new style resto box. Obviously the OEM is what it is. When I went to the fast ratio it felt dangerous! You cough and next thing you know your 3 lanes over. Way to sensitive and "twitchy". I combated this feeling by reducing the flow of the pump with a modified pressure valve. This simple trick gives the box more tension and a false road feel, perfect for weekend drives. This trick is not recommended but gets the job done for $20.00. Finally I went with a CCP (California Classic Performance) box. It's similar to the Delphi 600 but 1/2 the cost. Gives positive road feedback and makes her feel like a modern car.