My peak power of 202rwkw done with a highflowed R34 GTT turbo, if its anything compare to, is at 145kmh which is roughly around 6000rpm in 4th gear so, yeah it seems that the cams maybe the next restriction, although my power doesn't abruptly taper off, it just slowly starts curving downward...
Should be interesting to see how many trackdays this unknown RB20 manages to withstand with these kind of power levels
I might come down to the philip island day next month just to see it