hmmm...based on the engine spec...
BT20V
Max power - 165 ps (121.36 kw) / 7800 rpm
Max torque - 16.5 kg*m (161.81 N*m) / 5600 rpm
SR16VE
Max power - 175 ps (128.71 kw) / 7800 rpm
Max torque - 16.5 kg*m (161.81 N*m) / 7200 rpm
B16A
Max power - 170 ps (125.04 kw) / 7800 rpm
Max torque - 16.0 kg*m (156.91 N*m) / 7300 rpm
The engine out put are more likely the same...
only 20V need less effort to gain the max torque...
but then...power to weight ratio...engine weight...handling and so all...like you guys said...need to counted as the key factor too...
but then due to the SR16 limited production...i'm sure it's hard to find here...left alone the performance parts...
plus not all engine produce will have the same power output...plus most of this engine are already being "rogol" in japan only then bring back here...sooo...can't say much...
but i don't think most nissan guys will stay on N/A ... :D
for sure they'll go for "siput" power...
my 2 cents...