Mabye that 10 to 15 horsepower gain you heard of was actually that on a 99 cobra, but just mufflers alone on a 99gt ain't gonna do it.
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black 99 GT,cobra hood & nose. offroads flows, 4.10s, fms pullies, pro 5.0, C&L 80mm, K&N, cold air, 13.77 @ 99.87 on cheaters.
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