Alright, I have a greddy ti-c exhaust. On the pipping there exist a bung, and along with that there was a plug. Turns out I lost the plug, does anyone know what size the plug is? Or where I can get a replacement? As to the bung, I believe it was put there for the evo 8's o2 sensor.

 

if its a 02 sensor bung its M18 1.5. Jegs, summit, and race parts soultions sell the plugs in both steel and stainless.

 

Thank you.