Hi,
yes you will loose the auto volume increase, the GALA is also connected on the 26pin connector, i think thats the signal the NAV uses.
To be perfectly honest, if you go thru the hassle of removing the unit etc, you might as well add a switch while your there in my opinion.
with regards to special tools, you will need some Audi stereo removal tools. As its a Double DIN size unit you will need 4 of them.
They are available at halfords and local motorists centres and ebay to for not a lot of money.
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