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It wont' hurt mpg, but it will never pay for itself in savings, if there are any that can be measured. I installed a 4-2-1 header on my car after the stock manifold cracked, that's a good excuse to buy something that won't pay for itself. I definatly didn't see any drop in mpg. Mid range power is better which helps on Pulse and Coast routines to get to the target speed quicker. In summary, the savings is a fuzy number. If you enjoy the extra power and have the money, it won't hurt your mpg...
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