The fact is we're talking about aftermarket bolt-on kits, some company will use lower grade stuff to reduce cost so they can sell at a lower price which increase the chances of failure.
Now if you use the best possible resources and premium componenets like a custome build turbo system, turbo can be very dependable like the OEM turbo cars/trucks but expect to pay high dollars for that and you wont find very much of that in the aftermarket accessories market.
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