I voted Flowmaster, but if I had to do it all over again (which unfortunately I have to), I would get the SW Retro Chambered.
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GPI SS3 Cam / PRC 255 heads / Forged 376ci bottom / Fore level 2 fuel system / D1SC ProCharger on 12lbs / Alky control dual nozzle / 770 whp / 649 wtq tuned by Ryan Stevens at GPI
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