Honestly just find used OEM exhaust from a GT. Plenty of people put it up for sale after doing exhaust on their GT's. Including fab work and cost of parts I only spent about 600 bucks on my exhaust. It's true dual and everything with the exception of the OTA pipes are Ford OEM. Great sound, my opinion best way to go.
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“I don’t lose any sleep at night over the potential for failure. I cannot even spell the word.”
Gen. James "Mad Dog" Mattis USMC (Ret.)