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Exhaust work is cool. You can change the torque curve of a motor, and that can net some horsepower.
As for the emissions, If you take off a cat, and it gives you that much mpg's I'd suspect that the cat was bad.
I'm also fairly sure your Honda motor produces far less emissions than a Ford Truck, even without a cat. But it's what keeps your ride legal, so... good luck.
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