take a look at solo performance's stuff, they use muffler x's to kill rasp and j pipes to kill drone. tons of videos of v6 camaro's and v6 challengers (both 60 degree motors).
they just released a coyote exhaust, apparently planning a cyclone exhaust as we speak (ive spoken with them)
2013 Performance Pack, MCA, Leather Recaro's, NAV
Steeda Cold Air Intake | BBK Throttle Body | Steeda Shifter Bracket | Whiteline Transmission Mount | Magnaflow Street Catback Exhaust | Tuning Super Store Tuned on a Diablosport Intune i1000 | Eibach Sportline Springs | Koni Sport Dampers (Yellow) | Whiteline Lower Control Arms
Team Magnaflow | Team Road Race Motorsports