There isn't a whole lot of preformance gain in going duals with the S197 V6. I'd stick to the single, Flowmaster, JBA, SLP's, ford racing(made by borla) and upgrade either CAI/tune or gears!
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Car: 2006 Tungsten Grey, Mustang Side Louvers, White Brake Calipers, Flowmast Axle Back, TI CAI XCAL 2, Dyno tune by Alt Auto, many look good mods interior and exterior.
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