I got the rear drivers side 1/4 panel sheet metal nibbled out and d'matted the crap about of everything up in there:

http://icd.ics.purdue.edu/~berk/pictures/MyXterra/Dynamat/RearQuarterPanelDriverSide/

This is where I'll mount my amps:
- Kenwood KAC-923
- PPI PCX440

one on top of the other.