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Stock is 3 all the way through I believe. If you have the chrome tip, it may be 3.5. Easiest thing to do is measure the mouth of the exhaust tip to get an exact answer
 

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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
 

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Discussion Starter #4
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!
 
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