TUXBLACK50

I'm getting a muffler for my 2011 5.0.I haven't decided on what brand yet but I know the stock pipe is 3" .Do I need the 3" in and 3" duel out or 3" in and 2.5" out.May be a stupid question but I've read some diff. threads and now I'm confused.I was originally looking at 3" in 3" out but will this kill the power of the truck ..low end etc..?Any thoughts?

2011_Mcdaddy

I'm looking to do the same thing a SIDO from magnaflow so it can look like the harley, i was looking into the dual exit after tire. Waiting for headers tho