so i have a 97 camaro with the 3.8 and i have put my headers on and am now building my exhaust. i want to make my own exhaust and need to buy an 02 bung for my post cat. does anyone know what size the bung is? i think its the 18mm bung but am not 100%. anyone know?

 

I got a s pipe from one the guys off this forum so it dint come with a bung. $25 and a trip to the exhaust shop it was all good. Why do you want to make your own exhaust? Nothing great will happen 3.8 don't need to breath much. Even the procharged 3.8 only require single 3" piping.

 

M18x1.5

 

kinda have to. the headers i bought have 3 inch collectors and the stock 3.8 exhaust is like 2.25 inches. i bought a spun cat that i will have welded then getting an s bend and will weld an 02 bung in the bend and attatch a purple hornie to the end of it. right now the car will not stay running because the oxygen sensors are not connected.