OBX Performance Racing Exhaust header 00-05 Lexus IS300 2JZ GE 3.0L DOHC

My catalytic converters went bad on my car, I needed something cheaper, so I decided to buy these. My mechanic put these in for me. He said he struggled a bit to put them in, but still managed to get them to fit. The car pulls fantastically great! You're gonna get a check engine light, my OBD computer says that the catalyst threshold is low. It's basically detecting that there are no catalytic converters. All the O2 sensors go where they are supposed to go.