The Perrin turbo heat shield for the Subaru WRX and STI is CNC formed from 304 stainless steel. It is also adjustable front to back allowing you to cover as much of the turbo as possible and the backside of the shield is cut to fit all aftermarket downpipes. The Perrin shield uses spot welds, instead of rivets. When spot welds are done correctly as Perrin does, they will hold just as good as any bolts or rivet and will not loosen over time and rattle. High quality stainless steel hardware for a complete installation is included.