I have a working ECU from my 2004 Spec v with no NATS (Nissan Anti Theft System)The first one is in my car. It was uprev tuned by Vinny Ten Racing. UPREV cost $675 and I paid $300 for this ECU! The NATS (Nissan Anti-Theft System) has been turned off so it does not matter if you have a key with a microchip. I think $400 is a fair price! Perfect for a Spec V with intake, headers and exhaust! Ask me questions! P8 ECU’s are very hard to find!!!!