Did you have to deal with the two cat exhaust system to get through CA BARExhaust system pics in the quote below using LCE 3RZ swap headers on a 3rd gen pick up. This unit passed CA BAR smog referee inspection.
Some notes for success:
Ref wants to see catalyic convereter in the original spot. Their standard is the inlet flange being +/-3" of OEM distance on the donor vehicle.
O2 sensors must be in original location (distance) from cat flanges AND must have correct angle orientation as donor vehicle.
After the post cat O2 sensor, you can run it how you like.
Maybe we could get together and i could pick your brains, I am part way through the conversion, just put the engine in