Also, when the buzz climbs with revs, its alternator whine. One at a time (checking between each to see if its fixed) re-do the grounds for the amp, the stereo, and make sure your alternator and battery wires/ grounds are good, free of corrosion or paint.
No longer own: '12 V6 Perf, from Sept '11.
Mods: TWM 520g Piston shift knob & Barton shift bracket, AM short shifter. SR 1.5"drop & AM street phb. Tokico D-spec, Whiteline bars F&R, J&M Lca, 25mm wheel spacers, 18x10x4 Bullit style on Sumimoto rubber. Magnaflow Street's. 25' of b-quiet ultimate, 10" JL [email protected] 350w, JL TR's upfront. Bama Tune, B&M 73mm & Shorty headers.
Someday..... Twin Turbo, or SC goal is 450 whp. Has to wait until warranty is up