Where is my amp?
I have a US-market 2002 325xiT, with the 10-speaker non-HK sound system. I'm pretty sure I have an amp because when I took the front door panels off, each speaker wire went into the car separately. Also, the woofers are 2-ohm drivers, and I doubt they would be run off the HU.
However, it's not in the driver-side of the trunk area, and is not under the flap that's just forward of the spare tire well and held down by body clips.
Where else should I look?