Applicable: 99% gasoline motor car Get the sound of sports car, Remote control and very easy. Power connection: 12V power supply, three ways to connect 1. Connect the cigarette lighter, 2. Connect the battery (turn off the engine no power, need fuse wire) 3. Connect ACC (turn off the engine without power, need fuse wire) Note: Please install it under professional instruction. Install front and rear of exhaust d for naturally aspirated engine, And only install front of exhaust d for engine that's on forced induction through a turbocharger or a supercharger. Sounds very nice that in a gasoline engine car. But in diesel engine car that the sound is not as good as in a gasoline engine car. And special diesel engine with turbo, the sounds effect is very badly. Colour:As Shown Material:ABS+Metal Specification: 63mm Package Contents: 1 x Electric valve 1set x flange square elbow(63mm) 1set x Receiver and power line 1 x Remote controller Specification:51mm Package Contents: 1 x Electric valve 1set x flange square elbow(51mm) 1set x Receiver and power line 1 x Remote controller Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.