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Where the exhaust exits at the bed is it thee inches or three and one half??

 

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I got this info from another website.
From the downpipes, Y pipe 3'' od pipe going to a 2 bolt flange (aprox 5-1/4'' c/c bolts), then its reduced to 2-1/2'' od in to the resonator all the way to the flexpipe, then 2-3/4 into muffler inlet, muffler oulet is 3'' od all the way to the tip.
muffler is 27''long x 12'' body,
Resonator 14'' x 6'' body

Thanks. I thought it was three inches. Appreciate it!