Ive been in the same gtr and driven it with the 517's....havent seen the 2860R's in a gtr infromt of me so havent had a chance to see in in action, having said that cant knock the 517's as they seemed to come on nice and early for what they are. I dont doubt they arent as responvice to the 2860, it from the trim size described they would easily.
I dont wanna be made out like a jackass so I thought id have to give another of my 2cents.
Ash, as stated you have been in a car with 2860's thats fine, theres a bit of a difference between sitting in a passenger seat and driving a car, so I cant see why you disregard the 517's so fast...I guess it all depends how you drive the car aswell....
each to their own....anyone wanna give me a ride in a 2860 powered GTR? So I can see what all the fuss and a fuedin is about?
peace
Jez