Complete set as a solution against loosening bolts, fixes perfectly Manifold bolts / turbocharger locking plate for T4 Fits all turbocharger turbine housings and turbocharger manifolds with T4 flange Complete set as a solution against loosening bolts, fixes perfectly The bolt and nut connections of the T4 turbine housing to the turbocharger manifold with T4 flange often tend to loosen. This is almost impossible to prevent, as the cold and hot temperature phases and corresponding driving style cause the bolts to the turbocharger turbine housing to loosen. Our plate is as simple as it is useful. It is clamped in between and the tabs on the screw heads are simply bent upwards. The heads of the bolts are then secured against rotation. Fits for: T4 turbine housing and turbo manifold with T4 flange. For Twinscroll and Singlescroll. Please note: Example photo. You will receive the locking plate, screws are not included.