The reduced profile associated with the front side bulkheads allows the air tray to sit lower for improved CG. The top of surprise mount place can also be incorporated into the bulkhead eliminating the necessity for another shock tower and creates another flex modification the front suspension using included cross brace. Aluminum bulkheads are CNC-machined from premium Swiss 7075 T6 aluminum to give you the lightest & strongest framework the car. Black coated.