from what I have learned you can use the 4 banger and import turbos, but you will need 2 of them. I was going to use 2 off of the nissan sr20det motors, but never got around to finding the matching turbo. Rule of thumb is to equal close to 5.7l....like 2 turbos off of 2.5l would equal 5.0, two 3.0l turbos equal 6.0. So the sr20det turbos would be a little small, only 2.0liters, but I was just going to see what would happen. I bet you could make budget yourself around a grand. buy used stuff and not name brand. Don't know how efficient it will be or how long it will last, but it will give you knowledge for the next project.
my 2 cents.
Travis