H13 Tool Steel Head Stud Kit - Lamspeed Street Series - GR Yaris G16E-GTSLamspeed Cylinder Head Stud Kit H13 Tool Steel For the GR Yaris G16E GTS Engine For applications where you have turned the boost right up over 30psi and plan to keep the head from lifting. This is the first thing that occurs from testing when pushing the limits when Lamspeed set the World Drag Record in a GR Yaris running a 10. 5 @ 131mph to then setting the GR Yaris record around Sydney Motorsport Park at the 2022 World Time Attack Challenge with a