Vibrant's Ultra Quiet Resonator incorporates a bigger sound-absorption chamber to suppress sound more efficiently than typical bottle-style resonators. This resonator features Vibrant's "True Straight-Through" perforated core that's surrounded by premium multilayer sound-absorption material. The Ultra Quiet line is designed to help eliminate the "rifling" noise of most 6-cylinder and 8-cylinder vehicles that have straight-through performance exhaust systems.