Oh found it, it was in a mag, Racing Lines, Austatralian Mag.
The artilce was by Luis Sola,
http://go.to/solaspeed .
Shocks different colour
GS15R has larger optional head, and piston looks like it has been machined, and the sleve has cross hatch honing finish. Suppose to make run in easier.
The radio plate-receiver box has been redesigned, throttle and brake linkages run directly off the servo.
The fuel tank now has a primer.
Chassis and drivetrain is the same.
Hope this helps.
Dazza