my bro in law is movin, and gave me a alpine e10 he had from when we re did his system in his car. So i wanna put this in my truck sometime. I have the rockford fosgate system, with the sub under the seat. Can i run this alpine sub with my stock amp? or do i need a new amp. also i wanna do this without fubar'ing my stock system up. whats first to do? besides get a box for it.