This header exhaust manifold for Nissan 350Z/G35 models from 2003 to 2006 is designed to free up extra horsepower. Switching from factory cast iron to this lightweight aluminum header manifold construction helps your engine breathe easier, allowing for increased exhaust flow. The new design routes exhaust gasses out of your cylinders quicker, while reducing the length of exhaust tubing for more power and a sportier sound. Simply bolt it up in place of your stock manifold for a simple upgrade that's sure to put a grin on your face.