Not Ranked
I have the 3" on my small block and Lainhart installed 3" on his 487 FE. We both love our Classic Chamber mufflers.
I had 24" x 2 1/2" on my Cobra.
I installed 28" x 3" with the louvers turned to scoop the air. They are a lot quieter. I can now talk to my passenger at 70 mph.
I recommend going with the longest muffler you can. It will be the quietest. For a FE the 3" is a must and turn the louvers open to the motor (scoop the exhaust air).
Dwight
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''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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