Turblown Engineering 13B stud kit -Aircraft quality forged steel -Hot rolled threads, allen head tips -195000 psi tensile strength -No machining is required -Works with OEM or aftermarket flywheels -Replaces all 16 inner tension bolts Why choose studs over bolts? Studs offer precise torquing of fasteners over bolts. Instead of twisting a bolt to achieve a desired torque reading, studs are stretched. Twisting creates friction, friction gives false torque readings, and the end result is a lower actual torque reading. Thus clamping force is reduced. These studs are made from far superior material, applied clamping force is increased even with the same amount of applied torque over bolts. Stud expansion is limited, while inferior oem bolt material allows them to stretch, and reduce clamping force. Studs are easier on front iron threads, OEM bolts cause wear and tear on threads. OEM bolts can tear front iron threads out. Acoustic harmonic and resonances problems are reduced from the superior material used in stud manufacturing. Engine expansion and movement is reduced with greater clamping force, a must for turbocharged or high horsepower engines.