I recently purchased my S Type.. it has a factory Nav/touch screen, (screen runs everything) but i don't think it has the upgraded/premo sound package. I have plans to have the dealer install the Audio Connectivity Module. but What i am trying to do, now and on my own, is put in my after-market amp and subs. I thought about tapping in a HI-low converter to get RCA's in the trunk, don't know if that is smart tho. Does anyone know if they nav system has outputs for RCA's anywhere in the car or on the radio. or, has anyone done this? are there hidden wires or connections anywhere in the trunk? I know a few people have put in after-market stereo equipment into there jags that have the alpine upgrade, and/or that do not have the nav system.

any help or guidance would be greatly appreciated!!