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Nice data...
I'm sitting on a Borla ProXS (18" case, I think) right now, but I was looking for a bigger can for "more muffle".
I think the FC rear can easily go 20" long case, with the possibility of going 22" case if you got good welding skills and patience.
In our experience, the best power versus price / size muffler is an off-set in / out with perforated tube design.
Makes sure the perforated tube is the same diameter as the in / out pipe - there are some mufflers who neck down the tube inside the muffler itself.
The offset design attenuates the acoustic element of the exhaust noise very well.
Offset = one side center; opposite side to one side of the muffler.
In a pinch, you can use a center in / out muffler, but angle the inlet and outlet pipe as much as you can.
This design doesn't muffle as well as an offset muffler, but you'll get kinda close.
-Ted
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