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Hello, up for sale is my CX Racing header for NB miatas. It is heat wrapped for cooler engine bay temps (yes, really, it was tested) and has one o2 sensor port. Yes. this header did improve performance, mos notably torque at lower rpms (3-4k). I love the sound of these headers as they are pretty good compared to other ones I've heard (others sound more raspy). PM if interested, local pickup only in SoCal. $200. Thanks