copied directly from crossover_auto
"ARP Exhaust Manifold Studs
Perfect for aftermarket manifolds or the stock manifold
Great fix for exhaust manifold leaks due to loose or broken stock fastener
Full Stainless Steel
Super strong, corrosion resistant, rusted fasteners will no longer be a problem
170,000 psi tensile strength, substantially stronger than grade 8 hardware
Easy to install due to hex broached tip allowing use of hex bit to tighten
Set of 10 studs, washers, 12 pt nuts
M8 x 1.25
38mm or 45mm length
38mm can also be used for factory manifold to turbo(4 total) and any Garrett T25 turbine housing to S-pipe (5 total)
45mm for manifold if you want to use the washers. 38mm fits stock mani if you do not use the supplied washers.
"