I had a leaky Thorley gasket on my toyota. While changing it i noticed that i had a hole to my exhaust that is just bypassing the header. I looked back at my original install pictures and it seems that there was some sort of plug there that must have fallen out. I just finished installing my header with a new gasket and i filled that hole with a new stud. Should i be worried that the other one will come out as well? What are these holes, part of the old EGR system?



Its the far right flat head in the picture.