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the obx header will fit the b20a5. the reason the b21 cant use it is the b21 car had only 1 o2 sensor mounted in the downpipe in front of the cat. the reason other b series headers won't work is because they all have a different port design and flange on the head. you have what is known as the bastard b series engine, and the only piece that is interchangeable between the newer b series motors and yours is the adjustable cam gears. all of the headers can be found on ebay, jegs, summit sites.
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89 4ws tokico blues/1.5 inch drop
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