Custom build features twin-turbocharged
3.8-liter Duttweiler Performance V6
(November 7, 2024) SPRING GREEN, Wis. — Ringbrothers, the custom car builder and parts manufacturer, has unveiled its latest creation, a custom-built 1987 Buick Grand National known as “INVADR.” The twin-turbocharged Buick produces 1,246 horsepower and 1,000 foot-pounds of torque to the rear wheels and was engineered from the ground up.