model is AOEM-NIS2
This allows you to keep your bose and add a sub/amp

http://www.sonicelectronix.com/item_...AOEM-NIS2.html

this place sells it for about $50 shipped

my price: $35

i bought it, hooked it up and the same day came across a head unit i wanted, so back out it came.

it says it works for 95-99 with bose, but will work with almost all NISSANS with bose. I was using this with my 05 SE-R