2007 V-6 Mustang dual exhaust

It depends on whether you will be putting true dual exhaust, or "Dual outlet" exhaust on, and what brand you will be using. You should be able to expect about a 5% increase in power, so about an extra 10 HP for you.

A Free breathing exhaust will increase horsepower , torque , and fuel economy ( provided you don't lead foot it all the time ) So duel exhaust will help , as well as header upgrades too ( over stock exhaust manifolds ) Just make sure the upgrades are emission legal .

Ford sells a V6 Dual Conversion Kit that comes with a warranty. It includes all the parts you will need. It's part number M-5230-V6* I have the X-pipe on mine and it does seem to have a little more get up and go. It has not effected the gas mileage.

i have dual magnaflow resonators on my 6 and it seemed to increase gas milage, and an increase with hp...but then other upgrades id reccomend like headers and intake.

Waste of money if you don't slap and intake and headers on it. Horsepower increase of 8-10 if you pick up the right pipes. Look up what others have done with the specific setup you're thinking about because if you mess with the O2 sensor in the single exhaust your computer may lean out your fuel to "compensate" for the lack of exhaust flow and fuel/air composition past the sensor. Remember, more gas more go.

People that say they noticed a power difference due to their exhaust are full of crap. To even have a slightest noticeable difference you'll need to change alot more