Correct installation is the key to ensuring your new turbo doesn't give problems in the future.
First things first, why did the original turbo unit fail? Did you know that over 90% of turbocharger failures are caused due to outside influence? This can be oil contamination, oil starvation, incorrect turbo boost pressure, foreign object damage, as well as blocked engine breathers, CATs and Diesel Particle Filters. Before fitting a new turbo unit, you MUST find the cause of the original failure and correct it before fitting the new unit.