Features: Made of lightweight aluminum CNC machined from 6061 T-6 Aluminum. 1 muffler tip for best effect. Install on aftermarket muffler, catback, axleback muffler it will not produce any sound. Easy installation. Universal fits for most cars with a straight OEM muffler exhaust, doesn't fit the elbow muffler. Descriptions: Loosen the screw on the Turbo Sound Whistle. Place the Turbo Sound Whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler. Screw the screws on the Turbo Sound Whistle to tighten the item so it doesn't fall off while driving. Specifications: Color: black. Size: L 2.0-2.4 displacement. Type: Exhaust pipe sounder. Package included: 1 x Exhaust pipe sounder.