In short yes the more red is more powerful but....Not quite sure if this is the place to ask this but what do the different colured letters on TDI or GTI mean? e.g. if the DI bit is red does that indicate that it is more powerful?
When talking GTi's. The older 1.8T's were badged GTI silver, then they were changed to GTi. Silver GTi is also used on TDi 150, though imo its better badged as TDi as it is on the engine cover. It doesn't bother me enough to change it.i always thought the red 'I' meant turbo.
silver GTI NOT turbo