Fitment Information K Series Engines with 4 port exit cylinder heads. Specs & Features 100% Brand New Made from Ti-6AL-4V Titanium. Replacement for the OEM Bolt and studs on existing that hold the manifold from the factory. BURNT TITANIUM FINISH FOR ALL STUDS, WASHERS, NUTS USA Seller Shipping within 1 business day No instructions included, we highly recommend professional installation. This kit includes the following: 5x TITANIUM STUDS 5x TITANIUM WASHERS 5x TITANIUM NUTS Product Description K - Series Exhaust Manifold Bolt Kit TITANIUM BOLTS WITH BURNT TITANIUM FINISHGive your vehicle the attention to detail it deserves with these exhaust manifold titanium fastenersLeave behind all your rust and corrosion issues FOREVER! Never again deal with a manifold that is hung up on a broken or rusted in place stud. Not only are they, lighter and stronger than stock fasteners, but extremely corrosion resistant and will not rust or fall apart over time like many stock fasteners.All of our titanium studs are designed with a 3mm hex fitting in the head of the stud for easy installation.