I know this is off topic, and KWZX10, don't take it personally. I just see that mistake a lot around here, and it bugs me:
The M3 GTR Race Car featured in GT4 and GT5 is NOT and has NEVER BEEN a DTM car. It was an ALMS endurance racer in the (then called) GT class. It has won the Nürburgring 24h in 2003 and 2004. There has never been a DTM car based on the E46 M3.
There has been a "M3 GTR" touring car racer, but this one was based on the E36.
And both these cars are not to be confused with the E92 M3 DTM Concept presented last week, that will take part in next years' DTM. BTW: WOW!!
It's only PD that decided to allow it into their version of "DTM" in the game. Same thing as the R8 race car. Endurance racer, but allowed in so it has a purpose in the game.