Specifications: Made of light weight aluminum CNC Machined from 6061 T-6 Aluminum 1" muffler tip for best effect (OEM Muffler) Install on Aftermarket muffler, Catback, Axleback muffler it will not produce any sound. Easy installation Universal fits for most cars w/ A STRAIGHT OEM Muffler Exhaust, doesn't fit the ELBOW muffer. Weight: 255g Material: Aluminum Alloy Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Installation: 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