I've noticed more (somewhat un-important) differences in the SRT and my 2004 that may (or may not) have been overlooked.

1. My 2004 had drain holes drilled in the exhaust tips to allow water to drain - which it did quite well - SRT does not.
2. SRT 6 exhaust tips are painted black on the inside and the 2004 was silver/aluminum on the inside (hope that makes sense).
3. Leather on the steering wheel in the SRT seems of much better quality - softer and "richer" feeling??
4. Door trim is different - different texture and maybe color scheme???
5. SRT wheels are MUCH harder to clean.
6. Radio display is different, more LCD like in the SRT, probably a fix to the "wash out" of my 2004 (couldn't see it in bright sunlight - I know, a TSB somewhere).

Thats about it...exhaust tone is much deeper - but so is the whole powertrain (pretty obvious) and all the other known differences.