L31MaxExpress
I'm Awesome
Ran that box for 5 years on the 83, been in my climate controlled office of the shop since it came off. I will throw some Deatschewerks connectors in line so that I bypass it easily. The box I have is the OG one not the newer digital design. It made a noticeable difference on the old 83 G20. That MSD equipped engine once made it home after the fuel pulsator (springy rubber fuel hose GM used on the TPIs to help prevent fuel rail noise and injector tapping) in the tank split, dropping the TPI from 46 psi to ~20 psi. Wideband was pegged lean the whole way home yet the MSD was still lighting off the mixture, no idea how lean it was, the wideband went off the scale at 1.25, so it was leaner than 17.6:1.It will have your a$s walking home if that counts as a change.
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