i know that the Rb26 it is rated at 280 but alot of people i talk to in places like 24sx.0rg or unstablehybrids and other internet sites say it is 320, and i can agree with them. the rb26 is not all AWD becuase the calosonic and the pennsoil GTR (they are skyline race cars)are FRWD believe it or not. they sport the rb25tranny!
In japan motor laws is stated that in cars they cant have no more than 280hp,(they must of lie or somthing to get pass by.) that is why there are so many after market parts for cars like the skyline and motors.
No other engine is better then the inlined six of the sklyline that can put out 1,255hp accept for the RUF or porche, becuase they have the same type of TT engine. I didn't want the supra engine(if i did go with a toyota engine i rather go with the mr2 engine because it is lighter and can put out as much as 700hp.) because the rb cost about the same used, but you can get it port and polish and it will run like new.