This is a typical ebay turbo special from DNA motoring:
http://dnamotoring.com/web/
This type of $100-$600 turbo specials you find on amazon, eBay, or now walmart are super well known for having sketchy wastegates that don't let you control boost properly. Seen plenty of these at my friends shop that require quite a LOT of modification and work just to get them to work right, and after that they last maybe a 12-18 months in racing scenarios before something blows or gets stuck blowing the motor as well.
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