The pipe is made of high quality 304 Stainless Steel ,the motel beside is made of high quality aluminum alloy. Fit for 2.5/64mm exhaust system.Two valves/flaps type. The exhaust cut out is made to enhance the performance & sound of your vehicle with Just A Touch Button. To open the cutout you simply flip the which and it will open your exhaust for a throatly rumble exhaust note. There is no instruction included . Professional installation is strongly recommended. The exhaust cut out is made to enhance the performance & sound of your vehicle with Just A Touch Button. You can weld this exhaust cutout anywhere after the header of the vehicle. To open the cutout you simply flip the which and it will open your exhaust for a throatly rumble exhaust note. Size:2.5 Inch /3 Inch(About detail size,pls look our photos) Package include: 1 x Stainless Steel Y-pipe (Approx. 11) 1 x Wireless Rmote control unit w/ 10ft Wire Harness (You will get same products as our photos) Note : Please check your size of your enxaust system! There is no battery included in the package ,you should prepared it by yourself . Battery : 27A ,12V