The Cayman GT4 is a different animal, developed by Porsche's motorsport department in Weissach, with engine, chassis, brakes and aerodynamics configured for maximum performance. (driving.ca)
The Porsche motorsport department is presenting... (carsession.com)
Like the R, GT3 RS, GT3 Touring Package and GT2 RS, it's developed by Porsche's motorsport department rather than the road - car division that looks after the Carrera, GTS, Turbo S and so on. (motoring.com.au)