Exhaust Pipe Oversized Speaker Refitted With Turbine Whistle Features: This product is suitable for all automobile models and brands. Made of aluminum, light weight and durable. installed this product, the pressure blowing out of your exhaust will make your vehicle sounds like a turbo vehicle with the turbo system. Loosen the bolt on the Turbo Sound Whistle. Insert the the Turbo Sound Whistle into the tailpipe. Tighten the bolt so as not to fall off while driving. Product Description: Product Description: Normally: S is suitable for 1.0-1.6 displacement, and the diameter of exhaust pipe is 32-43mm M is suitable for 1.6-2.0 displacement, and the diameter of exhaust pipe is 37-48 mm L is suitable for 2.0-2.4 displacement, and the diameter of exhaust pipe is 44-55mm XL size is suitable for displacement above 2.4, and the diameter of exhaust pipe is 56-85mm Package includes: 1*Exhaust Pipe Oversized Sound Maker