Ok, my car's description: 05 3.5SE W/ navigation and bose system.
There is NO pre-outputs on the back of the stereo.
However, in the bose cars there is a pig tailed lead intertwined with the amp's wiring. It is the input for the XM/Siruis sat units. The catch is - That the inputs are low level, they are not RCA cables either though.
It is a pretty simple looking connector, and i have the pinouts for it from work so if anyone wants them, i have posted them in my yahoo account.
I will give you a link here, just remember, i cant promise they will work for everything, these are to my specific bose w/ navi altima.
if theres something else, i'm sure i can hunt and find it (just in case i missed something).
That should be them!