I belong to a Camaro Club were people have a variety of V6 exhausts. My favorite is the MRT 2.0. It would be on the top of my short list if I had a V6.
I have not heard a NPP system on a V6 but I personally love it on my V8. Quiet when cruising but loud when I want. Perfect for a daily driver. Someone on this forum has a retrofit for 2012 and earlier cars.
Those would be my two choices.
2013 ZL1 BLACK on BLACK
2010 2SS/RS BLACK on BLACK <SOLD>
3" MBRP 304 Stainless Exhaust