Thanks jairen! just stumbled upon that too. Is the use of a brillo pad between the non foulers necessary? Also since the v2 already have a bung built in do you still need 2 non foulers per cat or just use one set?

 

i used one nonfouler on each side.....worked for me. but u gotta drill em out for the sensor to fit through. if you buy some at autozone or whatever.....the o2 sensor will not fit in it cuz its not opened enough. just get a big enough drill bit that is a lil bigger than the tip of the sensor and drill the non fouler out.

 

thanks for the help guys