As far as the tune goes: if they're just testing via OBD, then you should be fine. OBD tests look for readiness monitors and trouble codes. If the monitors are ready and there aren't any DTCs (CEL), you should be fine. And, if you have the device (HP Tuners interface), you can always just flash it back to stock before inspection.
The CAI and charge pipes provide zero performance gain. (DDM has publicly said as much.) They sound cool and look neat, and make it less of a pain when removing your intake manifold (again) but that's about it. They're bling. (I have them and like them, but they're not a power adder on a forced induction engine.)
If they can spot a high flow cat, they must be paid more than the techs in Texas. But, it's California, so who knows. It's a great mod that lets the engine rev a bit faster.
There are quite a few owners here that have posted about Cali inspection difficulties, including one guy with a Mallet that had all kinds of problems.
Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders
'07 GXP, RPM Stage 2, Solocatless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , Stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces