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87 is fine. The only things that are different between HX and EX engines are the head (specifically the cams and rockers), pistons, transmission, primary O2 sensor (manual trans is 5 wire), and ECU. The transmission and intake and exhaust manifolds are also different. The HX has the catalytic converter positioned right after the exhaust ports on the head. I'm pretty sure the information I gave is pretty much correct (I had thought about converting an EX to HX, but gave up on the idea).
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