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This question has been asked many times. Here's the low down:
The SR20DET is NOT emissions legal in the U.S. The SR can be cleaned up by using a CAT and keeping most of the OEM emission devices intact.
If the emissions testing in your state doesn't require a visual inspection of the engine compartment and your 240SX is an S13 which doesn't use OBD-II, then the car should pass. If the car is an S14 with OBD-II and the emissions testing equipment plugs into the OBD-II connector, then the car will fail; also if the facility does visual checking of the engine compartment, the car will fail.
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