If your going to change or add a turbo to your car. Here are some great web sites to help you pick the right turbo. There is a bit of science to it so make sure you do your research.
To find boost and airflow calculatorhttp://www.rbracing-rsr.com/calcboost.html
compression ratio vs boost tablehttp://www.xcceleration.com/cr-boost%20101.htm
fuel injector calculatorhttp://www.rceng.com/technical.aspx
Hope these help some of you. I will add more when I come accross good ones.