Resonators/glasspacks help a lot at removing rasp. You get them welded in just after the mid-pipe. 18" length at a minimum, but I went with 22". If that doesn't take enough rasp out, then I would recommend a tamer axleback. A few options would be Bassani, MBRP, or Borla S-types.
2012 Kona Blue 3.7L V6:
Borla LT headers, O/R h-pipe, Borla S-types, 3.73 gears,
Steeda adjustable UCA w/ mount, BMR LCAs, Airaid CAI,
LCA Relocation brackets, AE driveshaft, GT 80mm TB,
Black 18x9/10 2010 GT500 Wheels w/ Nitto NT555s,
Eibach Sportline Springs/shocks & Koni STR.T Struts