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You can tap into your rear speakers with a pair of rca's. Basically all you do is cut off one end of the rca's and connect the cut end (positive and negative) into your rear 5x8"s. Then run your rca's to the amp inputs. You may suffer sound quality a bit, but I couldn't tell when I did my last install like this. If you have a good quality amp (I had a JL 500/1), your quality will not suffer as much as if you use some crappy brand amp.
As far as the remote turn on wire, I'm not familiar with the Raptor yet since mine is on order. But you should be able to contact any stereo shop and find out which wire to splice into.
If it is setup anything like my 09 it was extremely simple.
Cut the plug to the sub, solder it into an RCA plug and viola, you have low level signal.
Since the amplifier recieves a low level signal already there is no need to convert it, simply change it to a connection you can use with an aftermarket amplifier.
I still ran an 8 guage wire from the battery however as i did not trust the 12 guage(if i remember correctly) that was supplied by the factory amplifier plug.
There also was no remote lead, so i had to run one from the fuse panel switched power source.
It can be done, but getting the signal is actually the easiest part !