Has anyone done an LC8/CNG tune...?

Does the stock GM IFR table (E38 file) seem to slope the wrong way (rail pressure 100 psi (689 kPa), returnless system)...?

How much ignition timing does CNG allow...?

What PE EQR does CNG like...?

Is Catalyst Over-Temp Protection valid to use (does excess fuel cool the cats, or does it heat them up more), if so what COTP EQR to use...?

Thanks in advance.
Regards.
-Joe