Does anyone know if these things are reliable? I heard through the grape vine that thier incredibly unreliable because they were made with cheap labor in Mexico. The car I'm lookin at has a customized stillen motor na for the 300z with about 42k on it. But before I dive into a car like this I would like to know what to look for in this type of set up. Problems, strange mechanics or just any other helpful info in choosing a 300z NA engine.