ScratchBC

Hi This is my first post so please go easy. I'm getting my RX 400h in about a week :D and I've heard bad thing about the factory sound system. I've got a cuple of questions. 1) Does the stock Head Unit have preamp out puts in RCA style? If not how would you go about hooking up an after market amp? 2) What size are the speakers F/R? 3) Where would the best place to install a 10" sub in the car w/o a custome enclosure? Thx a lot ScratchBC