Has anybody found what the bhp limitations of the small turbo eec-iv system is?

My calculations put it around 325bhp mark. I've based this on the following;

The standard MAF sensor pegs out at 737.75 kg/hr of air, and assuming the engine was 100% efficient at 7000rpm then only 514.5 kg/hr of air would normally be consumed. This means that the standard ecu can calculate to 143.39 % volumetric efficiency. This ties in with the LOAD_SCALING_SEALEVEL_TABLE that shows the engine can achieve 144% VE at 4000rpm and above.

As the EEC-iv can only deal with VE's upto 200%, this means that if you swap the MAF sensor for one that measures upto 1029 kg/hr and program your chip to recognise this modification you could see power in the region of 325bhp based upon Pro-Flow MAF calibration information.

Any one have any other experience or thoughts?