I added sub to the HiFi system after I did the BSW upgrade. I used the same alpine amp as themishmosh. I mounted it the amp under the cover in the hatch and have a JL 12w0 with a larger than desired enclosure. Sounds great with the BSW upgrade. I did not use the premade harness but got the wiring diagram from the dealer and soldered in and added my own LOC. I tapped into the aux power for remote. I am ok with the sub being off when the car isnt running.
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