Nistune
 

Do you have to upgrde to a Z31 ECU to use Nistune or can it be used with the factory unit?

Yes, you must use a Z31 ecu. Originally you had to have an 88-89 n/a ECU, but I remember someone saying you can use any Z31 ecu... The main issue is being able to remove the stock EPROM and install the cable adapter.

Previous ZD discussion (good links at the bottom by 260zturbo): https://www.zdriver.com/forums/showt...hlight=nistune