Upgrade critical hardware in your Ford, Chevy/GMC, or Dodge Ram diesel truck with XDP's Stud Kits, Bolts & Fasteners. XDP Head Studs and Main Studs can handle increased horsepower and torque levels. XDP's manufactured line of fasteners also includes hardware that is commonly replaced during service or repairs, such as exhaust manifold bolts, oil pan bolts, and starter bolts.