Brand New Kibblewhite Extreme Heavy Duty Head Stud Kit & Cometic 99mm-100mm Big Bore Top End Gasket Set. Fits Years 2006 2007 2008 2009 2010 2011 2012 2013 2014. Fully CNC Machined For Precision. Nuts Are Machined From Billet High Tensile Steel And Heat Treated. Studs Are Heat Treated 180,000 PSI Aircraft Alloy Steel. Both Nut And Stud Have Rolled Threads For The Strongest Possible Threads. Both Nut And Stud Are Black Oxide Treated For Enhanced Corrosion Resistance. 12 Point Chromoly Head Nuts. Increased Torque To 35-40 Foot Pounds. Cometic Top End Gasket Kit 100mm Big Bore. This is a bolt on kit with no machining required.