Aluminum Turbo Sound Whistle Exhaust Muffler Simulator Pipe BlowtoOff Valve Purple S or M or L or XL. Specification: toMaterial: Light weight aluminum. toColor: Purple. toQuantity: 1 pc. toSize: S or M or L or XL. Size: S. Length: 10.2cm. fits the car: Tail Pipe. diameter: 32to43mm. Displacement: 1000to1600cc. Size: M. Length: 10.5cm. Tail Pipe: diameter: 37to48mm. Displacement: 1600to2000cc. Size: L. Length: 11cm. fits the car: Tail Pipe. diameter: 44to55mm. Displacement: 2000to2400cc. Size: XL. Length: 12cm. fits the car: Tail Pipe . diameter: 56to85mm. Displacement: 2400andcc. Feature: to Made of light weight aluminum Machined from 6061 Tto6 Aluminum. to 1" muffler tip for best effect. to Install on Aftermarket muffler, Catback, Axleback muffler it will not produce any sound. to Easy installation. to Universal fits for most cars w or A STRAIGHT OEM Muffler Exhaust, doesnt fit the ELBOW muffer. Installation: 1. Loosen the screw on the Turbo Sound Whistle. 2. Place the Turbo Sound Whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler. 3. Screw the screws on the Turbo Sound Whistle to tighten the item so it doesnt fall off while driving. Package includes: 1 x Turbo Sound Whistle