Originally posted by its300zx:
http://www.240sx.org/faq/articles/spdgov.htm

I would just do this instead. Using an auto ecu is pointless.
Everything I've ever read or heard has indicated this mod doesn't work on the S13 with the SOHC engine (read some of the other comments attached to the link above). Take Bill up on his offer, he's a good guy and will give you a very fair price on the ecu.

Earl