If you are content with jsut a swap go JDM. If you want to take it further later down the road go with a usdm motor and then work the internals. If you do decide to get a JDM motor and need to pass emmisions that is no problem there is more than a few ways to pass with a few tweaks. Most of the time you can back down on the fual pressure or even add something that burns cleaner like a gallon or two of alcohol. I even had a buddy of mine pour a gallon of MTBE from home depot in his car to pass emmisions.
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