| Tested some mufflers on the flow bench at school taday. These four mufflers managed to flow better than the collector we used by itself. The collector flowed 316CFM Collector + Megan Racing Turbo Muffler = 380CFM Collector + HKS Hiper = 361CFM Collector + 18" Red Cherry Bomb = 347CFM Collector + Dynomax Race Muffler 3" = 324CFM From what we saw any barrol or can style muffler flowed better. Makes sense. These all flowed less than 316CFM Edelbrock was just under 316CFM Best of box style mufflers Regular style Dynomax Borla Magnaflow Flowmaster Spin Tech
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