Replacement of the JBL Digital Amp...to get In-Dash Navigation ability

[EdinAthens]

I have an 06 DoubleCab Sport LongBed that arrived with the JBL Premium Sound System with the rear Sub.

I really want to have an in-dash navigation system.

I would like to change out the head unit to the Eclipse Navigation / DVD but due to the digital fade / balance / tone being controlled by the Amp, I guess the Head Unit will only work if I get rid of the factory amp.

I was looking at a Digital Toyota Navigation Head Unit that plugs right in to the factory harness and controls the amp, but the headunit is over 1/2" wider than a Double DIN replacement dash and bezel and isn't curved like the Tacoma dash and just seems like too much of a pain in the ass to modify.

So...

1) has anyone here performed this task?

2) can someone tell me that I'm wrong and that I can just plug and play some other hardware?

3) am I going to have to cut and resplice each wire back there at the amp?

4) Are there any other suggestions out there - other than leave everything stock?

Thanks,

EdinAthens