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    best place for o2 sensors?

    Hi Guys I'm new to this Lexus lark. I'm fitting a 1 -UZFE to a London taxi, and I'm making my own headers due to clearance issues. Ive modified SBC block huggers to fit Lexus flanges, my question is, where do, I fit the O2 sensors? I ve been reading on here about headers but couldnt find advice...