NIRA i3 works with everything with from 4 to 10 cylinders...However, does nira work with the GM LSJ engine as well as the SAAB L850 ?

I am using it on my BigBlock Corvette from 1968

But it is an aftermarket system, so you have to connect the wiring harness supplied with i3 to your sensors, and do a compleate tuning.
So you need some engine tuning knowledge, a wideband Lambda scanner and to be perfect a chassis dyno to do a safe tuning, but it is fun! Realy fun! And you can do every thing! And ofcourse brake everything if you run the engine leen....