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they are all going to flow the same, the longer ones will be a little quieter, why are you going with flowmaster? if you were wanting a better flowing muffler get an 18" magnaflow, they flow almost triple what flowmasters do and they're smaller too.
+1 on that, magnaflow flows really well, because its a straight through designs.
It wont resonate like the flowmasters. It has a deep powerfull sound.