Ok. I have a question about o2 sensors and catalytic converters. I have a 97 5.7 1500 4x4. The exhaust is shot beyond simple repair. The previous owner did some hack job welding. It's still in the factory configuration. I have a 99 OBS 5.7 vortec with a new exhaust system the previous owner paid to have installed. This exhaust has a Y-pipe pre-cat, so its a single cat system with only one post converter o2 senser. Since mine has the two pre-cat and 2 post-cat sensors, what would be the best way to put the new system on my 97 truck? Could I just add both my post converter o2 sensers somewhere after the converter? Thanks for the help!