Single Muffler Advise

I you want my input for my 3" muffler coming off the DP let me know. I'm sure a 3.5" should be the same.
 
I plan on running a 3" in 2x2.5" outlets and a custom turnout. Replace the Cat with a dump pipe and muffler then run your pipe out the sides or out the back. My $.02
 
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