As much as we love horsepower, it's components like this that make real performance. This 8" Ford rear axle assembly with Wilwood brakes and a good posi with proper gearing will do more for your performance than any engine modification. In a single stroke, the engine is moved into its correct rpm range, and static weight, flywheel weight and unsprung weight have been reduced. You will feel difference in acceleration, handling and braking. You will especially notice a big difference in the ride and comfort of your car.