K20 swaps are really expensive. The the motor itself cost about $4000. Mounts,axles,ECU, Harness, etc... cost about $2000. And labor, that all depends on who installs the motor.
i THINK hmotors sells a complete k20a2 for 4grand, shipping costs around 200-400. my friend eric said he'll drop it in for 800, so 5g's(or close to) should take care of me,right? if not i could go type r but....