I'm in the process of adding just a SUB+amp in the trunk. I also bought the LCI2 since it says it compensates for the bass roll off So i should be able to tap it into the rear speakers. is this what you did? If not where did you tap into? (factory sub amp output?)
I think the rear speakers will be fine, but I ran mine up to the sub amp just above the driver kick panel.
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.