hi guys, just bought a w reg hgt. Basically i wanna keep the sat nav in as it is, but below where there is a 5 disk changer i want to replace this with my own head unit.fit 13cm infinitys in front, have 6x9s for the back, a 1100w 6-channel jbl amp for the boot with a 1000w rockford forsgate sub.

sub amp and speakers not too hard, but anyone changed the head unit this way leaving the sat nav in? apparently might be problems with the sound coming from the sat nav, also not proper connection in bottom slot to fit my head unit....

any advice be appreciated