I dont think theres much even G5 can do to get around this issue, you basically have to have a fuctioning OBDII port to pass aircare with 1998+ vehicles which, as was mentioned, SR20s don't have...
They scan the OBDII port for any engine codes and you don't pass if anything is flagged. A ton of the components in a vehicle that can throw OBDII codes will effect tailpipe emissions:
Quote:
In the CARB OBD II regulation (section 1968.2 for 2004 and
subsequent model years), section (e)(16) comprehensive
components are described as any electronic input or output
powertrain component that: (a) is used for any other OBD II
monitor; or (b) (when malfunctioning) can cause a measurable
increase in tailpipe emissions during any reasonable driving
condition. The components typically monitored under these
provisions include: cam sensor, crank sensor, IAT sensor,
MAP sensor, MAF sensor, A/T shift solenoids, A/T input
speed, A/T output speed, A/T torque converter clutch
solenoid, A/T oil temp sensor, idle speed control valve, glow
plugs, TPS, baro sensor, and vehicle speed sensor.
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Basically to make the process more straightforward they just scan the OBDII port and if no codes are thrown they just assume the engine is producing a manageable amount of emissions.