Columbia 8" Throttle Corner BoxThe 8" Throttle Box is another great product of Columbia's that offers years of great performance. All billet construction with a threaded stainless steel ball, this Corner Box looks and operates seamlessly. All Columbia's Corner Boxes now come standard with automatic capabilities, making pushing the box at least 50% easier than standard boxes. The new springs have adjustable tensions and greatly reduce the occurrence of air pockets while running. The