FYI, Just ran a little test today on these new cats to see how they'll operate at startup thru engine hot idle speeds (light off & low temp operation) using my trusty Foxwell NT301 scan tool. After 10 mins into startup (cold start into CL w\ idle @ 750 RPM's, ECT @ 175*F so thermostat was still closed), both cats lit off at 950*F (just after PCM started reading B1S2 & B2S2 voltage outputs into live data) w\ B1S2 hitting .810 mV & B2S2 hitting .825 mV holding steady. After 15 mins more w\ engine at full hot idle (ECT @ 195*F at 750 RPM's) both operating CMBT's @ 982*F w\ B1S2 @ .750 mV, B2S2 @ .750 mV also holding steady so these MagnaFlow #5461336 cats are operating perfectly at these low idle speeds so there'll be no doubt of operation once engine load%, RPM's & CMBT's increase so I now have good baseline data to use to compare to in any future checks. In contrast the Kooks Hi Flow Race cats (back during the 5-20 tests...BDG CEL Eliminators skew this part of operation) wouldn't quite light off & heat up the same under the same scenario (at 998*F--was post cat temps, not CMBT's--B1S2 @ .187-.475 mV, B2S2 @ .325-.725 mV) but once engine RPM's were increased B1S2 voltages would climb to mimic B2S2 voltages so were showing to operate, but from data & knowledge gained since then I know now that the EVAP purging cycling thru the FRPP IM's poor EVAP port design was messing w\ their operation (getting hit w\ excessive unmetered O2\fuel fumes that the cats couldn't control\oxidize well enough so excess O2 was breaking thru substrates during each successive EVAP purge cycle causing the rear O2 sensors to slowly increase switch rates over time until B2 cat crossed the PCM CE ratio threshold ahead of the B1 cat........ The best advice I can give you would be to go on your State's web site to look up the Emissions Requirements to see if there's any info given surrounding your setup configuration (to date I haven't found any that do have info on aftermarket FI setups except CARB) then find a local who has a similar setup as yours to see if there is a specific certification station to go to that is manned by well versed certification techs who actually know the EPA\State regs well to get you squared away. This part will most likely be the biggest challenge at this time IMHO...... Not much but hope this helps.