Corsa Performance Exhaust (or rumbling down the road)
I had a Corsa exhaust on my 2005 GMC Sierra when it was an option from GM. The new system on my 2015 seems to be of the same good quality and looks. The sound is more of a throaty rumble that quiets right down on the highway with no drone coming in the cabin. I had a professional install it in about 1.5 hours. Overall happy so far.