Reduce interior exhaust noise while maintaining unrestricted exhaust flow with the Apollo GT Series 3 IN 409 stainless steel resonator. Straight through perforated core insulated by sound dampening materials for a smooth, civilized exhaust tone without compromise. Easy clamp-on install with factory-style flanges. Only fits aFe POWER exhaust systems and does not fit stock exhaust. This system is constructed using 409 stainless steel for maximum strength and durability. High quality stainless steel clamps are used for a hassle-free installation. 100% MIG-Welded for race-proven strength and durability.