Universal Aluminum Turbo Sound Exhaust Muffler Pipe Whistle 1. Made of light weight aluminum alloy material. 2. Easy installation, Universal Fits for all vehicle. 3. Sounds like a turbo vehicle with the turbo system or blow off valve. 4. Whistler diameter: S / 1.8cm. Universal Aluminum Turbo Sound Exhaust Muffler Pipe Whistle 1. Made of light weight aluminum alloy material. 2. Easy installation, Universal Fits for all vehicle. 3. Sounds like a turbo vehicle with the turbo system or blow off valve. 4. Whistler diameter: S / 1.8cm. Universal Aluminum Turbo Sound Exhaust Muffler Pipe Whistle 1. Made of light weight aluminum alloy material. 2. Easy installation, Universal Fits for all vehicle. 3. Sounds like a turbo vehicle with the turbo system or blow off valve. 4. Whistler diameter: S / 1.8cm. Universal Aluminum Turbo Sound Exhaust Muffler Pipe Whistle 1. Made of light weight aluminum alloy material. 2. Easy installation, Universal Fits for all vehicle. 3. Sounds like a turbo vehicle with the turbo system or blow off valve. 4. Whistler diameter: S / 1.8cm.