ITEM NAME:Car Dump Valve Turbo Exhaust Whistler Simulator Blow Off/tail Whistle Sound I2U5.1x Turbo Sound Simulator Whistle. Place the Turbo Sound Whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler. Loosen the screw on the Turbo Sound Whistle. Screw the screws on the Turbo Sound Whistle to tighten the item so it doesn't fall off while driving.
