I've been around turbo stuff long enough to know that cheap anything tubular or steel is definitely "you get what you pay for".
hell, my entire modding existence has been based on that mantra....which is why these cheap ductile iron manifolds confuse me. Obviously they won't flow the best, but with some good ole fashioned dremel porting, they should be pretty good, and last forever.
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01 Sentra 1.8 turbo (sold)
91 Sentra SE-R turbo (sold)
03 350z turbo (RIP)
07 Mazdaspeed3