This is for those that have an OBD1 e36 or with a swap. These are for OBD1 use only since the emission part of this has been welded shut. Both o2 sensor holes are open for your choice of where you want your o2 sensor to sit. I got some Supersprint clones so I no longer need these. Great mod and better flow than the cast iron ones. Asking $105 shipped to the US.
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