Blue Large Turbo Sound Exhaust Muffler Pipe Whistle Blowoff Valve BOV Simulator Whistler.Description: Color: Blue Material: Aluminum Size: Large Feature: This muffler whistler is used to give your exhaust that sporty whistling sound. Make your vehicle sound like a turbo vehicle with the turbo system or blow off valve. Made of high quality and lightweight aluminum. Fitment: Universal fitment for most vehicles. Installation: Loosen the screw on the Turbo Sound Whistle. Place the Turbo Sound Whistle body inside the exhaust muffler with the