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2 1/2" is all you need, and to appease johnny law, there are high flow converters available..Before I removed the under the car exhaust sytem, I would buy headers first, fords are really restriced from factory on the exhaust side and headers help this, then when funds are available you can upgrade the rest of the exhaust, another good improvement is underdrive pulleys, and a good cold air induction kit, with the mods and a gear change, your mustang will "wake up" somewhat, and FYI there are 50 state legal Nitrous kits available..
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