You would want one side branch per 2.5" exit pipe after the mufflers. The direction does not matter for the branches but the length and location do (anywhere after the final resonator or muffler is fine). I would use 36-40" to kill drone in that range. I would note though that you may eliminate 80% of the drone range but not all since this only affects a short frequency range. It should help plenty though. You can always test different lengths of pipe (make the welded elbow and then clamp on different extensions) to see which works best and then weld it permanently. They do have to be capped at the end of each branch too, no packing inside though. The diameter of the side branches should match the diameter of the primary exhaust pipes.
PS - nice numbers, what turbo did you swap in there?
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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