dieselcarpenter

What are the pros and cons of having a waste-gated turbo? Why/when should I even consider a watse gate?

wannadiesel

There are no cons.

A wastegate allows a smaller turbine housing for quicker spoolup while still keeping boost under control.

You should consider a wastegate when your boost gets over 35 psi. At that point the turbo is mainly an air heater.