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I Just Had Mine Installed , I Watched Them Do It The Battery Is In The Trunk So He Ran The Power And Ground For The Amp Right There , In The Left Panel In The Trunk Is Where The Factory Amp Is,he Tapped Into Those Wires And Got The Rca Signal,the He Tapped Into The Fuse Box In The Trunk On The Right Panel And Got The Remote Power For The Amp, I Got This Installed In My 2011 Gt535i, U Will Need A Test Light,and A Small Speaker To Test Wires For The Rca, I Forgot What Color The Wires Are,but I Think They Might Be The Thick Blue Wire With Red Line.hopes This Helps Out.
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