Dear friend, the sound of this sound simulator is similar to the sound of a daily used whistle, the sound is relatively bright, not a noisy booming sound, the sound is a little smaller compared to the booming sound. Please do not place an order if you mind this!!! Specification: Type: Car Turbo Sound Whistle Material: Aluminum + iron Item Color:red, blue, gold, silver, black. S size is suitable for 1.0-1.6 displacement, exhaust pipe diameter 32-43 mm M size is suitable for the displacement of 1.6-2.0, the exhaust pipe diameter is 37-48 mm L size is suitable for 2.0-2.4 displacement, exhaust pipe diameter 44-55 mm XL size is suitable for displacement above 2.4, exhaust pipe diameter 56-85 mm Packing list 1*Turbo Sound Whistle