Anyone know which manufacturer makes the new Killer 9 engine?

http://www.redrc.net/2009/07/rb-killer-9-buggy-engine/

Looking at the bore/stroke it is no NR model. Also 16.20 x 17.00 does make 3.504cc which is not alowed. But 16.20 x 16.90 is the same as the Sirio CL7B engine which is possible because the Xenon series were also made by Sirio.