I translated the discription from Japanese. This is what it reads.

"It is low with increasing the capacity of the YPVS operation interior, torque UP of the medium speed. Improvement of light weight conversion, and heat dissipation effect. The surface can obtain, when you attach with the hairline finish, the そ and others parenthesis is"

They look like they are flat across.I think what they are saying is less volume inside the PV area more mid range power. Now where is the gunk going to build up?