Where or who should I go to get duel exhaust on my car?

My car is a 2005 Ford Mustang v6 and I want to install duel exhaust on it and once I have enough money I'm going to buy a duel exhaust system from AmericanMustle.com and I would rather have professionals install it and how much would they charge me for install? So I need a little help here once I buy the duel exhaust system thanks

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