New Cat? Sounds like fun! Well, I have a '97 Civic LX, and I sure do have that second cursed O2 Sensor in the Cat, as well as the one in the exhaust manifold. Just FYI, the 97's (actually the 96-98's I believe) have the funky Exhaust Manifold directly into the Cat thing going on, which is different from most every other style, including other year Honda's.