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2005 GT3 Exhaust System

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Vehicle Information: Model: GT3; Year: 2005; Body Type: Coupe; Total Mileage: 5,000MI;

I'm looking at changing the exhaust system on the GT3 for weight reduction, throttle response, and performance increase. I've been guaranteed 18hp for headers and mufflers upgrade. I will not replace cats. Are OEM GT3 headers tuned to match exhaust positive and negative pressures with firing sequence? If yes, should I keep the OEM? If not, what should I look for, since they all look the same (T304 stainless, mandrel bends, etc.). I can risk marginal HP increase but not a decrease. I know what to look for in terms of mufflers but would you suggest buying same manufacturer headers and mufflers, or it does not matter? Any data and opinions are welcome.Thanks

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