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as soon as you mod the greddy it becomes street illegal, that means intercooler, external wastegate etc. If you want a lot of power it will not pass smog.
The intercooler is in the process of being CARB exempt. But a BOV, external wastegate are not CARB exempt, otherwise every turbo kit on the market would be.
Your smog experience will vary from place to place. I've been smogged with my turbo at a ghetto smog station around here. The guy didn't even care that my air filter was a piece of mesh clamped over my inlet. He also didn't seem to notice the blaring CEL that was ever-present at the time. You may be able to pass a smog check with a turbo setup, but the GReddy kits in stock form(no add-ons, period) are technically the only smog/CARB legal kits in Cali. I'm sure other states maye be a bit more lax on the whole emissions testing thing.