...oh boy... hopefully they learned from the rubber o-rings on the 3800's.

I don't think the isolators won't have any bearing on sealing. What ever is used to seal the injector needs to withstand the compression of the cylinder. Since the injector sits directly in the compression chamber unlike your standard fuel rail that puts the injector in the intake manifold.

The only factor listed here is power and torque, you could have a twin turbo really fast thing a ma gig up against a supercharge dohickey if the person behind the wheel doesent know how to handle and drive said whatchamacalit who knows who is to win the race

Niether new motor is force inducted.

Of course overall performance depends on what vehicle they put the things in. The estimated MPGs for both motors look very promising. I can't remember which one but one of the motors will be used in a midsize SUV and is expected to pull in 30 mpg.