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Could new mufflers cause loss of power?

April 26, 2017cadillac cause deville Eldorado ESC loss mufflers power Seville

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Could new mufflers cause loss of power?

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I got Corsa mufflers, which i must say sound amazing, but since then i have lost 2mpg average (with my wife driving mostly) and seems i feel a little loss in power. I have about 750 miles on car since putting mufflers on and i reset the average MPG guage, which used to show 18.4 and how shows 16.4. I know if i was driving the car mostly then it would go down because i love to hear the exhaust, but my wife drives it during the week while i travel and i rarely drive on weekends because my son loves riding in the Silverado SS (hes 2 and likes to be able to see out the windshield from his car seat). Same exact model D3 carries, ones made for the STS.