this item is a 1997 - 1997 S13 Kouki Blacktop sr20det ecu, that was sent out to Jim Wolf Technology for a better tune. It has been tuned for 550cc Injectors and a z32 maf, increased horsepower output. I also paid extra for a secondary map, which has a switch, it which allows better performance, and a different fuel map when running 100 octane, total price for this brand new from jim wolf was over $900, I will give you that recipt to the item winner. I am selling it really cheap because lost my job and need to buy my kids clothes for their new kindergarden class. any questions feel free to ask. call me (310)713-7101 -steve any offers feel free to contact me