There are a lot of individual "I have a single mishimoto part and it works" type of reviews... I'm sure their products work fine for the majority of users. Please consider the idea that if a part has a 20% failure rate, then most likely you are going to be fine...but that rate is absolutely awful. Not saying that's what it is with them, just that you are, individually, a sample size of one.
The real issue, in my opinion, is that they source cheap parts with no care of the quality or consistency of them, then mark them up, repackage, pour in some marketing cash, and tell you how great of a job they did engineering them. Look at their catch can lineup, it's like a straight-from-china lineup on aliexpress. Like literally they are all just cheap chinese options. Some of them are pretty good (I happen to have a pair in my Z...non-branded versions), some are complete trash...But mishimoto badges them all and sells them with no conscience.
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