Magnaflow Exhaust Will A Magnaflow Dual Exhaust Improve My Gas Mileage?

Will A Magnaflow Dual Exhaust improve my gas mileage? - magnaflow exhaust

OK, I'm looking to purchase a 1997 Pontiac Sunfire GT Coupe. It has a magnaflow dual exhaust already on, and even after the sale. It has the 2.4 liter engine 150 HP on this issue. I know that the dual exhaust system is to me more horsepower and torque, but the improvement in my gas too?

Thanks in advance!