I have a 1990-1993 ECU for sale: GMS Stage III chip tuned for 370cc injectors, 5spd, federal emissions, single pop. This is a very good tune and has been doing me proud for about 4 years. With this ECU BEFORE the SAFC I put down 344rwhp/377rwtq...with about 5 boost leaks and a few wiring issues, so there is no doubt the power is there with this tune. I am selling since I will be going full standalone (AEM EMS). A chip by itself is around $200 depending where you get it. Price is 250 shipped. This is for the full ECU not just a chip.
(that is my writing on the ECU cover, it should come off. Its just to make sure that if someone buys it they don't get confused as to what it is lol I have 3 different ECUs sitting around and its hard tyring to figure out which is which)
Just an FYI, this tune was prior to everyone having an issue with Chip and his business so its one of the "good" ones. Feel free to make me an offer!