Welcome to clubwrx! I'll do my best to help you out here. These scenarios are the prime reason why I never buy a modified car. Technically with the current mods that you have listed (turbo back exhaust and aem intake) the car would be justified as a "stage 2" modified car per cobbs map notes for stage 2.
However, the car as it sits should have already been tuned by the prior owner. So if the car did not come with an accessport you could be in a couple of different situations. Neither of them are good.
First and foremost. Assuming the prior owner had it tuned with an accessport and flashed back the stock map, and unmarried the accessport and sold it private market, you should NOT be driving the car. The car not being tuned and running the stock map with those modifications will do damage to your engine and possibly cause a catastrophic failure (blown engine). If you must drive it, stay out of boost entirely until you get it tuned. This scenario is actually the better out of the two. Because if the previous owner unmarried the accessport you can simply buy a new one and flash the correct map and be in good shape.
Now for the worse possibility. If the previous owner flashed the stock map, and removed the accessport without unmarrying it from the ecu. This means that your ecu is blocked and no other accessport can connect to your ecu to make changes. If this is the case it means that you cannot tune (change the map) until the ecu is reprogrammed. Cobb can do this for you if you send the ecu to them, but it costs a pretty penny. Easiest way to tell if this is the case is by hooking up an unmarried accessport to your wrx and seeing if it will marry itself to the ecu without issue. If so, then just follow the steps to flashing the correct map. (if this is the case I for one, feel bad for you, and for two still strongly suggest not driving the car as mentioned above)
As far as the downpipe goes, the only way to tell what the brand is will be by unwrapping it. But a downpipe is a downpipe and it should be obvious if it is at least aftermarket or stock. With it being wrapped there is a 99% percent chance that it is aftermarket. But again, brand doesn't really matter too much. A downpipe is a downpipe.
Also, you need to ditch the bov. Atmospheric blow off valves are bad for these cars. You need to replace it with either the stock or an aftermarket recirculating valve.
If you need anything else let me know. Good luck!
However, the car as it sits should have already been tuned by the prior owner. So if the car did not come with an accessport you could be in a couple of different situations. Neither of them are good.
First and foremost. Assuming the prior owner had it tuned with an accessport and flashed back the stock map, and unmarried the accessport and sold it private market, you should NOT be driving the car. The car not being tuned and running the stock map with those modifications will do damage to your engine and possibly cause a catastrophic failure (blown engine). If you must drive it, stay out of boost entirely until you get it tuned. This scenario is actually the better out of the two. Because if the previous owner unmarried the accessport you can simply buy a new one and flash the correct map and be in good shape.
Now for the worse possibility. If the previous owner flashed the stock map, and removed the accessport without unmarrying it from the ecu. This means that your ecu is blocked and no other accessport can connect to your ecu to make changes. If this is the case it means that you cannot tune (change the map) until the ecu is reprogrammed. Cobb can do this for you if you send the ecu to them, but it costs a pretty penny. Easiest way to tell if this is the case is by hooking up an unmarried accessport to your wrx and seeing if it will marry itself to the ecu without issue. If so, then just follow the steps to flashing the correct map. (if this is the case I for one, feel bad for you, and for two still strongly suggest not driving the car as mentioned above)
As far as the downpipe goes, the only way to tell what the brand is will be by unwrapping it. But a downpipe is a downpipe and it should be obvious if it is at least aftermarket or stock. With it being wrapped there is a 99% percent chance that it is aftermarket. But again, brand doesn't really matter too much. A downpipe is a downpipe.
Also, you need to ditch the bov. Atmospheric blow off valves are bad for these cars. You need to replace it with either the stock or an aftermarket recirculating valve.
If you need anything else let me know. Good luck!