what is the best sounding exhaust for my truck 08 gmc sierra single cab with a 4.8l

 

Most people seem to be running Flowmaster or Magnaflow.

 

i know but what series of flowmaster

 

Flow master: 40 series, super 44, 40 series delta flow, 50 series
Magnaflows: I want to say the 18 inch case length. I do not know the name or series of it... sorry
Those seem to be the most common ones I hear about. I am running a Flowmaster clone. Same muffler, but only a quarter of the cost.