The BMP billet aluminum diverter valve (BOV) is a must-have for a stock or modified XP Turbo! The stock valve is made from plastic which easily warps and can stick under high heat situations. This can cause strange issues and a loss in boost/power. Installing the BMP billet aluminum diverter valve gives you peace of mind knowing that will never be an issue. Every BMP diverter valve comes set with the correct spring dialed in for the XPT. Looking for that "chhhh" turbo sound? Check out the BMP diverter to atmosphere kit!