He bought the kit from a vendor at the NMRA races in bradenton, actually. I was surprised to see a vendor bring stuff for a V6 though. I am sure you can order it online anywhere. Hell you can probably go to any exhaust shop and have them weld up a flowmaster, and duals for about a couple of hundred bucks.
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Ryan
1990 Mustang GT (In Process)
1993 LX Coupe (Daily Driver, but just choose not to)
2005 Excursion (Big Pig)