All I can say is you get what you pay for...I've got no expirience with it, but personally I wouldn't trust it.
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Will the engine computer be able to handle the fuel with out any adjusting?
You can max out the fuel system with the stock turbo. Does that answer your question?
It sounds like you need to do some major research into how an engine works, how you get more power out of an engine, and general tuning theory.
Also, posts like this should be in the newbie section.