run three inch to the mufflers then 2.5 out the back, i have done a 69 with stock gas tank quadra link and 2.5 tailpipes, you can do it with 3 inch, your just gonna have 1/2 clearance from the rear end back around the tank, you also will need to hard mount the tailpipes so they do not move, isolate the muffler and there will be no droaning
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