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how much hp are you putting out on the motor? i would say go single 3.5 exhaust but WITH a muffler, my car with dual 3's into a single 4 mufflex dyno'd identical numbers with and without my mufflex/flowmaster exhaust as it did open headers, BUT with open headers my hp levels peaked 1400 rpm LOWER then with the exhaust (5200 vs 6600 rpm).
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