Skyline GTR32 RB26 Mines ecu

Fuel control has been optimized
*Ignition timing control has been optimized
*Speed Limiter Control has been changed
*Rev limiter has been expanded
*Further reprogram can be made depending on your modification

will run slightly higher boost pressures, and will be a little closer to the edge in terms of fuel and ignition settings, but still safe (provided you use the injectors as supplied if applicable, and the right octane fuel). They also tend to raise RPM limits aswell.
Mines have obviously worked out the Nissan codes and are able to re-tune the stock ECU. I believe you can get software to mod Nissan ECU’s, however I’ve not heard of anyone with a Skyline using it. The Skyline fraternity are not as resourceful as others, probably because there are tuning options available easily enough.