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BTW you should update your profile to include your location. The answer to this depends on where you live.
Passing emissions is Very Hard in a turbo car, unless you are lucky enough to live in the 3 or so states with no emissions testing at all. Nearly all states now require passing an OBD2 scanner test, which means you have to have some OBD2 ECU in the car (and passing readyness tests) when it is scanned.
There is a hack way I know to do this. It's not pretty, but it works if you are careful.
For inspection, you will have to:
1) Plug back in the stock ECU.
2) Arrange a way to drive the injectors. You can either replace your larger ones directly with stock, or run a piggyback hack (like a VAFC) with a large fixed fuel cut. The VAFC maxes out at -40% I think, so it would work with injectors 40% larger than stock.
3) Stay out of boost. The simplest way is to hold the wastegate open constantly. You can do this with bailing wire from Home Depot and wrap it around the WG arm and wire it to something fixed. That should ensure you are always in vacuum.
4) Drive always in closed loop when you are about to get inspected. OL shouldn't be that bad if you have done all of the previous things, but to be safe staying low throttle is a wise idea. CL ensures that you will be running with AFR feedback, and the ECU will keep you at 14.7 on its own.
Now if you happen to live in a place that has a visual inspection, you are totally screwed. There is no way to pass visual with an aftermarket turbo, so this whole theory is moot anyways. If you want to get extreme you can play games like selling the car to a friend and avoid the inspection process, but that sh*t gets really sketchy and the DMV may catch on to you at some point.
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