In the process of sourcing engine for my wife's Gen 7 2003 Honda Civic Si Vtec D17A2. I'm bit skeptical about price and mileage? I located engine in Georgetown thats still in the car 2004 Civic 142,000km $500.00. I was considering go with a jdm spec motor.. Is there any change in performance, pnp and how do I know its jdm motor?