I just got my SRT6 about 3 weeks ago and love the sound system. I'm pretty sure it's what everybody else has. The infiniti with nav. I used to install systems way back, and with the subs that are behind the seat, it's equivalent to a pair of 8" subs in a fourth order box, pushing at least 75w a channel from a good quality amp. Not talking the cheap stuff that says 1000w on the box. Like an old Rockford Fosgate that was still made in the USA. Now it's not high end either, but pretty darn good for a factory system in such close quarters. It wouldn't be hard to bypass the factory amps and install a clean amp with lower distortion, but it would mean tearing apart your new car. I've torn apart a many new cars to put in alarms, but I have no intention of diving into mine. I want to add remote start, but am reluctant to tear into the wiring. I guess that's another topic all together. I'll post a new one.
If you go into the Gallery section you will see a sweet custom setup that someone posted showing a double din, with the controls beneath the radio moved to the center console. It's so clean you don't even think about the wiring that was involved, never mind the awesome fabrication. If any of you know who this was, send them my props.

Love my SRT6,
Cruzinquick