why time attack.. makes easier power.... great mid - high end torque.. while hitting almost 9k rpm... engine response on a RB is insane if done up properly..
ov course u can go with a 2J and 1J.. but lets say you did decide to compete in time attack.. for instance GTA.. this allows you to compete because you use a engine from another car.. but from the same manufacture
i wouldn't DD / track a RB engine.. at all due to insanely expensive.. replacement parts..