...EVERTHING important on their vehicles, including the ECU/EPROM on the Z(if not stated, then implied). JWT had to have entered into an agreement of some kind with Nissan to access the stock code to make the changes they make. If they(JWT) would have gone ahead and marketed their POP program chip without permission, Nissan would have shut them down in a heartbeat!! You figure out the rest of what's happening now........