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B21F vs B230 exhaust manifold, interchangeable? 200

I asked because the preheat hose on the B21/B23 emanates from the headpipe. If preheat was the only concern you might have been better off finding the apparatus for the older model.
The oxygen sensor is another concern. As you know, it's right at the outlet of the manifold on your B21. On later cars it's further downstream in the headpipe, almost to the cat. Too new a manifold and you won't have a place to install it.
You will only have opened a can of worms if you buy the wrong parts.
--
'80 DL 2 door, '89 DL Wagon






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