The MagnaFlow 1964-1966 Ford Mustang Performance Exhaust Manifold Down Pipe 16445 is a premium weight-optimized mandrel bent exhaust component designed for superior flow characteristics and engineered to enhance the performance of your 1964-1966 Ford Mustang 4.7L. Each 16445 is produced using precision CNC robotic manufacturing techniques and features 100% durable corrosion resistant stainless steel construction. Professional installation is highly recommended.