It all depends on what is in the turbo kit.
Post up what is included with the manufacturer names and specs.
Example: GReddy TDO4H-15G Turbo, Spearco Intercooler, GReddy 47mm Wastegate, etc.
As for the information you already provided, I personally wouldn't trust it. The price seems too low giving me the idea that it's probably a scam or is pieced together using "ebay" parts. But then again, a reputable shop did offer me a brand new turbo kit for a 350Z for $500 because it had been sitting in their closet for a year and they didn't plan on using it for their project car. So it could still be legit.