What is this all about?

R&D GP 1300R Free Flow Exhaust Kit is required with higher horsepower output engine kit packages! The Free Flow Kit reduces water resonator back pressure and heat, which will reduce detonation! The R&D Free Flow Exhaust Kit features a new water volume flow control gasket that will reduce the excessive amount of water flowing into the resonator box. The Free Flow Kit will deliver instant throttle response and help make low and mid-range fuel controller settings much more defined and precise! Adds a great performance sound.

Taken from their site. Since when did they started using the flow gasket to control the water?