[IC]

The T-5/T5 is simply an engine type rather than the R which is a marque. Cars were available with a range of engine types and specifications. The very first high pressure turbos did not have a T-5 badge, they just had a Turbo badge on the back. When people refer to a T5 they are talking about the engine in the car - not a marque. The five pot Rs (Which stands for "Refined" have a high pressure turbo as well). The current C30 T5s have a T5 engine, however it is a different five pot engine to the old 70 series.