Did i miss something, i didn't see where the OP indicated the amp he was using? Also you will need to find a 12V turn on wire for the new amp. The harnesses for the stock amps does not have one, so you will most likely be running this from the fuse box, unless the amp you have chosen has this technology built in, i know the LC2i can generate a 12v turn on wire as that is what i use for my amps. Obviously the ground for the new amp can be run right to the chasis where ever you decide to mount the amp.
2012 GT CS Ingot Silver Vert, Edelbrock E-force supercharger with CAI and 3.5 Pulley, Tremec T-56 Mag, Accufab 84.5, Centerforce DF, Billet Yoke aluminum driveshaft, FRPP 3.73 Rear, MRT Performance H-pipe, Bassani axle backs, JL Audio sound, Edelbrock strut tower brace, JPC adjustable UCA, UMI adjustable panhard bar, KW V3 coilovers, Steeda heavy duty front mounts, Steeda rear LCA's, 20" Steeda Spyders with Michelin Pilot Super Sports, Steeda Big Brake Kit ....... it just keeps going.