Quote Originally Posted by Lease-V-cross
One thing I am afraid of is all the extra fees they will hit me with at the end of lease if I turn it in.
Your lease accounts for a certain amount of reasonable wear and tear. This usually means something like "$500 damage per panel or $1500 total exterior damage" or the like. If you replaced the head unit, it's likely they won't even notice that it was swapped out. And if they do notice, it's likely that they won't charge you for the switch, because you repaired the damage.

I turned in my Honda lease a couple years ago with a badly repaired left fender and headlight, worn tires, completely worn out clutch, and several dings and scratches and only got charged like $100 for the rear tires.