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For one, 5.0 Coyote`s have a whole slew of issues. They're a great naturally aspirated motor, but they have issues with piston rings and rod bearings. I sure as hell wouldn't strap a blower to one and expect it to last longterm.
I firmly believe that if you want 20% more power than stock, you're better served buying a faster car. It's a lot cheaper in the long run and fewer headaches. Financially, it makes a lot more sense to buy a used M3/4 if you want a reliable 450-500whp in a BMW. Sure, you can buy a Pure Stage 2 turbo and make that level of power but the car will undoubtedly have far more issues and you'll have to trouble shoot a lot of things and very likely spend more money doing it. With the M3/4, it's essentially a Stage 2 setup and is plenty powerful for the street.
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