Ford Racing has a muffler similar to that that was used in thier fr500 exhaust system for the Mustang Cobra. You can buy the mufflers seperately, but they are kinda pricey at $300 for the pair (cheapest I've found so far). The fr500 mufflers are backpressure operated instead of vacuum. They are for 2.5" pipe and both inlet and outlet are offset to the same side.
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