I have OEM resonators and 4" Magnaflow race mufflers. The side branches go at 90 degree angles to the exhaust flow so the sound will travel down them effectively. As they are capped, there is no real exhaust flow through them.
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2013 Ford Mustang GT
374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd
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