for 2000-3000 you will get nothing. Once you get the custom exhaust and intake manifolds, oil and water lines made etc, it will be 2-3000.
Keep in mind that if you want "full" boost by 2000 rpm, the turbos will have to be very small. It also depends on what you define as "full boost". e.g. if you say 2 psi is full boost, sure, you might even be able to get a 3040 to be on "full boost" by 2000 rpm.
Keep in mind that the capri 3L motors are shit. To further that, if you run twins, you'll only have 1.5L 3 cyl pushing each turbo. Keep this in mind. an rb20 has a tiny turbo. yet it won't even hit 10psi by 2000rpm. That is on a 6 cyl 2L.
If you were to use 2 of those turbos, you'd probably expect 10psi by 4000+ rpm.
keep in mind that it's not just the cost of turbos, as mentioned aboe, there are manifolds. piping, intercooler. ecu. injectors. fuel pump. fuel pressure regulator.
the extra power will probably kill the stock gear box and diff. so budget for that.
The budget is not 2-3000 for a twin turbo setup. Think more along the lines of $15000.
I know you didn't ask for opinions, so I won't tell you that it's not worth it.