You have a Duratec. PS, your Vin should be 17 characters long, you are missing a digit.I just purchased a 2006 ZX4 SES and I am wondering if I have a SPI, Duratec, or a Zetec engine. My vin is 1FAHP34N06217713. Usually there is a sticker under the hood that will tell you, but I cannot find one. Thanks in advance.