Kobalt:
DaveGordon:

 I wonder if blowing more money on more hifi will actually have any effect.

From a sound quality perspective: Yes , when you stand still, with the engine off - And I guess you don't do that very often.

any dollar spent on a sound system upgrade in my GT3RS would e a total waste of money. the sound system is provided for free by porsche and it is in the rear of the car. i suspect it won't be much different in the GT3 non-RS.