not sure if you plan to use o2 sensors if you do check my post here
http://www.skylinesaustralia.com/forums/O2...rs-t298491.html
reckon you will run into the same or similar problem as R34 o2 sensors are a larger thread and I suspect longer reach than R32
Flanges can be machined just extra cash involved if ya cant do it yaself or at least at mates rates
dont reckon it would be to pricey anyway