Exhaust question

[rolfsent]

I have a 1999 Yukon Denali I want to get a flowmaster Super 50 SUV muffler but I can't seem to find a definite size to get. I need to know which size I need for a stock fit. I plan on keeping it single out.

 

[ch4d]

i think its 2 1/4 dual inlet with a 2 3/4 outlet i believe but i went three.

 

[SunlitComet]

should be 2.5 dual input and 3in. output.