Using the actual, measured head flows of both a 30mm port and 36m port, the exact same cam and compression ratio, and displacement, in a commercially availavble engine simulator program, shows that the 911S power is as advertized... But wait--!! using the lesser 30mm ported T head on the same engine gives YOU WILL HAVE TO READ IT FOR YOUR SELF power. And this type of engine simulator program is deadly accurate when used to compare power in this way.
THe first sheet is the measured air flows, actual, the second is the results of the simulation. The first is the 30mm ports, the second the 36mm ports. The last sheet is the general cam and engine specs.
Say what you will, these are the facts.
Now how much did you pay for that porting job??