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There are no stupid questions coming from a lack of experience. We all had to learn this stuff. The module in a 400 is directly above accelerator pedal and removing it makes a lot of extra space under the dash. Its only a few bolts to remove and probably a good idea to get it out of there.ok, further stupidity here. I ordered the Metra adaptor and Crutchfield sent me a Mastersheet on how to remove the radio and other parts. They show removing a tuner/amp module, that necessary? Or is that function taken over by the new radio? Plus I remember reading somewhere on this forum, that that unit can be the problem for all bad sounds, if so, does it need to be replaced?