Advice on replacing muffler

[El Camino]

I want to replace the stock muffler on my 2010 4.8L Silverado WT LS 4x4 with some sort of low restriction muffler to get a better sound.

I also want to run two tail pipes coming off the new muffler routing out behind the tires like stock.

My question is, under normal conditions, will this mild modification cause my truck to either run bad causing an error or not be able to pass an emission inspection?

Truck runs well and always passes emission checks.

Thank you.

 

[CamGTP]

The muffler is far behind any emission related equipment and will not alter the results of an emissions test.

 

Any non chambered muffler will be free flowing so look for something like that.

 

I prefer a magnaflow muffler or a dynomax muffler for a medium price range option. They likely have several to choose from and watching youtube video's does help to get an idea. Some higher end mufflers would be like a Borla muffler.