Ok im new at the whole audio thing so be easy on me.

Is there any way to get a head unit and keep the navi?

 

nope. your navi is the head unit. so replacing the stock navi with an aftermarket navi would just be unnecessary. what exactly are you trying to do?

i have a leased 08 TSX no navi and i think the head unit is just fine. i love the sound in that car. but now i have my 03 TL project car to work on