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in racing, especially professional racing associations, such as the JGTC, the regulations pretty much set parameters that make the cars as 'equal' as possible. so, to get that 'extra' edge over other competitors, race teams design for more balance in their car, more reliability, better aerodynamics, etc. in the case of the JGTC, they cap the power output: 300hp (GT300) and 500hp (GT500), again - among other things; other regulations on the motor include a displacement 'cap': the higher the displacement, the less air they're allowed to have (i.e. mandatory air restrictors). anyways, to answer your question: "Racecar Engineering" did an article on last year's Nismo JGTC R34 Skyline, which was powered by the, you guessed it: twin-turbo powered VQ35DE. they did it for a couple of reasons. first of all, by swapping from the RB26 to the VQ35, they were able to shave off a significant amount of weight (at least in terms of weight & engines go) w/ the lighter all aluminum VQ motor. also, as other people mentioned, the design of the V-type motor allowed for a more ideal engine placement: probably lower and further back into the chassis; what this does is lowers the center of gravity and balances the skyline's heavy front end a little better over the RB motor. there's probably some other details i'm missing (you should read the article), but that's basically, the gist of it.
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