Jack,
The DFI enabled engine delivers power very smoothly. I cannot say specifically about the DFI itself. I have a pre DFI 3.4 L engine converted to my Boxster race car. When comparing the two, the new DFI 3.4 is hands down quieter, torquer, and smoother. The new engine design with fewer casting parts and no intermediate shaft is a real blessing.
The LSD should be standard, but this is Porsche---they would charge for a steering wheel if they could. Wait a minute, they can--- I paid $510 for a thicker steering wheel on my CS. I would not have this car without LSD. I have noticed good stability in the wet with LSD. Other than that, I cannot say any more at this point. If you drive agressively or in wet and/or snowy roads, mechanical LSD speaks for itself. The fake electronic LSD is to be avoided. I also have LSD on my Boxster race car, but it was far more expensive as it was a purchase from Porsche racing division. I cannot tell any difference between them at this time.
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