$1850 halfcut - ae92 map gze
$400 - wire it up
$550 - exhaust
= $2800 + prob $100-$150 for oil and little crap
Sideshow did my wiring, his add is at the top of these forums now. Cost me $400 and he did a good job. Paying a pro saves heaps of time and stops you from putting a match to the car.
Might of forgot something, but with $3000 I reckon you could get one done.