i beleive you are looking for the FX2. apparently it si quite a bit more powerful at high altitudes and high temperatures than the B2. from what i understand it has the same gross weight as the B2 but could go up the the B3 weights, but then it takes on the B3 component times.
it uses an LTS 101-700 series engine with re-engineered compressor and turbine core (keep in mind i am not an engineer), that is generally torque limited, cheap to run, and good on fuel.
the new variants are built by heli-lynx as mentioned, and also their is a soloy version that is completed in olympia(?), washington.
hope this helps.