Installed mine yesterday. Took around 2-1/2 hrs maybe. 4 total including stops to run to the parts store and dinner. I think they sound amazing. They pulled some of the high pitch from the ATAKS out. Personally it's the perfect setup. Shorties, stock mid, borla ATAK's.
2013 V6 Premium: MCA; Perf Pkg; 8 psi Procharger; GT500 Brakes; AMR Wheels; Stillen Front Chin; GT350 window covers; BBK Shorties; Boss gauge pod (boost, oil & fuel pressure). Cervinis side exhaust & stalker hood.