Just wondering, I think I know the answer, but.

This would be applicable on my 4.8 with mods listed as below. Future perf. mods to come, but....

When I put the aerochamber on, just went with a 3" in/out muffler on the stock tubing. I'd kind of like to change mufflers to something a bit louder, but not deafening. Was looking at magnaflow and they actually have race series mufflers, I did not know this. I think they offer a 5x8x6" body, similar size to the flowmaster 1 chambers and such. Bad thing is that they only offer them in a 3.5" in/out or 4" I think. 3.5" in/out muffler would just be too much on my 4.8 I'm sure. At most the truck will get ASP Pulley, small torque cam, and possibly headers, but not even sure on that.

 

It's not going to hurt/help you any...

 

put some headers on . . .