Will ITR cat fit a B18B on a EG6.. and how do I tell a ITR cat from a GSR/LS cat(if they are different)...?

 

The ITR cat will have a bung in the back for the o2 sensor and will also have the flange that will go from 2 o'clock to 7 o'clock if you look at it from the front. I believe the LS one is 180 degrees backwards.

Joe

 

but it will fit a b18b?