See if it has the egr system (although he could have removed it himself). Ask him to see receipts for the engine. If he bought the jdm engine from somewhere he should have receipts proving it is jdm. I think jdm throttle bodies only have one vacuum port coming off of the top becuase they don't have emissions. The usdm has two. Thats the way it is with my jdm and usdm engine. Other than that I dont know. I hope that helps.
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