98-2002 Firebird Twin System Air Cleaner Assembly, shipping is not included. Volant Filter Box: Cross-link polyethylene filter box is engineered to specific design. It insulates and protects the filter from pulling hot air from the engine compartment, thus, increasing horsepower. Volant Air Duct: Cross-link polyethylene air ducts are sculptured to give the engine a less restrictive air pass to breathe. Larger diameters, unique bends and smooth transitions gives you maximum horsepower and awesome throttle response. Volant Ram Filter: Cleanable and reusable high grade filter media reduces air restriction and increases engine output. Precision pleat geometry optimizes airflow throughout the intake system. High Performance Silcone Connectors: High performance silicone hose connectors provides flexiblity while maintains strength and thermal stability. Stainless Steal Clamps: Marine grade clamps allows optimal performance with large operating range and available for virtually any application which requires maintainability and versatility.