On a V6, ecu and boost control would get you a handy gain without touching anything else.

Given its age a fuel pump would be good too.

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Would u be able to be a bit more specific

Which Ecu:
Which fuel pump:
Which tune:

Pretty much if this was your car what would you do to reach 200awkw. Serious newbie here lol

The car has full Tein suspension and fully adjustable sway bars front and rear, anti lift kit. Engine mods are full 3" tbe, intercooler water spray kit, anti lag system (something abou injecting heaps of fuel) and an aftermarket computer (but i pulled it ou and it says J2 on it) So it just needs some more oomph.

ecu -
Roll back the passenger foot well carpet again.
unplug the ecu loom
unscrew the ecu
bring it inside
open the metal box
take a photo of both sides of the case and the board inside the case. Make them nice high res clear photos, not a shitty nokia 3310 photo.
post them up here.
Then we'll see if it actually has an aftermarket ecu or not.

pump -
There is the Walbro GSS-342 pump which comes with a fitting kit to replace the factory fuel pump. Here is an example:
Walbro Fuel Pump Upgrade Kit - Subaru WRX 94-00 - Pro Speed Racing

Thats generally considered to be the easiest option for a replacement upgraded fuel pump. A pump on a V6 will be 13 years old, its a good idea to replace it now regardless of any more mods you might do in the future, unless you are certain that the previous owner has done one in the last few years

BOV -
An aftermarket venting bov is mostly for wank, they fuck with how much air the ecu is compensating for and is probably most of the reason you are running rich and stalling. Don't bother going to Subaru for a replacement OEM bov, it will likely cost you as much as a new Version6. Put a wanted advert up here for a stock bov, any 99-00 sti or wrx bov should fit.

AFM -
As mentioned above, 99/00 WRX's are know for shitty airflow meters. Good idea to pull yours out, douse the wire inside the tube with electrical cleaner, put it back in and see if it makes a difference. If I were you, I would aim to replace the ECU with one that doesn't use an AFM or will at least allow you to use OTHER AFMs, ie motec, powerfc, late model Link etc

fuel-
until we can ascertain if it does have a tune or not, I would stick to 98+ octane, avoid octane boosters. I prefer BP fuel or caltex would be my next choice, there are other 98 suppliers but quite literally, your mileage may vary

once we get these things sorted, then we can proceed to making some power

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Will get some photos today after work with the cannon 6d lol should be sharp enough for you

Why don't you just take it to a workshop and get them to suss it out...Maximum Motorsport or All Star Garage in Malaga or STechnic Garage in Maddington....

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^^ Thats what I would do.

If you say it has antilag, how do you engage it? It will deffo have aftermarket ECU to run that. (dont run it BTW)

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There is a switch under the water spray switch (in stock position) I havnt used it and probably won't as it doesn't bother me

i put $ it's a LINK Ecu

Photos of ECU

Attached Thumbnails