What GTSTboy, Kinks and others who agreed with them said is all plausible, but again so are the arguments which disagree. To say that Nissan designed something for a reason and thats that is nonesene as far as I am concerned. The last RB25 was built what, almost 2 decades ago now and the requirements and market undoubtedly changed by now. Almost every part on a nissan is replacable with aftermarket parts these days and some can simply be modified as is the case here.
The bottom line is this, unless someone has proven results on a dyno accross the rev range, no argument on here is substantiated. This is a really good discussion and if anyone has something else to add.........C'MON DOWN!!!!