http://www.germancarforum.com/internal-combustion/34137-autobild-bmw-m3-gts-vs-porsche-911-gt3-rs.html - from 0-200 the 911 GT3 RS is 2 seconds faster. You can read from this article that the new M3 GTS has no chance against the 911 GT3 RS because the M3 - is too heavy (+140 kg = about 280 lbs against the 911) - is not able to bring the full power on the street during acceleration - has also a light understeering in corners which is not the target for an ultimative sports car On some parts of this circuit the old E46 M3 CSL was faster than the new E92 M3 GTS.
...Credo sia questo il nocciolo della questione...Infatti il motore ha più o meno la stessa potenza di quello della M3 standard...Anche se gli metti 500CV come li metti giù poi? Il motore sta dalla parte sbagliata!!!