1HZ/1HD-T Exhaust Manifold StudsSuits all models of Toyota 1HZ 1HD T FTE engines. High quality stud with copper coated nut. Suitable for high temp pressure applications on boosted engines. Nickel coated stud for superior corrosion resistance Copper coated nuts to prevent loosening over time Works with OEM and aftermarket exhaust manifolds Superior strength and clamping pressure Prevent blown manifold gaskets, particularly in high boost applications