The why?
Well it's a story of fear and making money out of it.
Not saying there are a lot of problems with this engines, but i really wouldn't put 3K in a car worth 9K or maybe 15K just for not have that fear and than have the engine failing by another part.
So, don't buy cheap stuff just because it seems cheap. Buy stuff that works. And if you don't know how things work, go to a professional or go into to topic and learn everything about it.
And please don't use Youtube videos as a proper install guide. In general they lack of different details.
Just my 2 cents
Markus
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