i've tried to look it up and there wasnt really and specifics on gains, but as with most exhaust upgrades you'll probably gain a little top end because of the higher flow....just my opinion.
2012 Fusion Sport, 56k miles, White Platinum Tri-coat. Every option except nav. 28% tint, Diode Dynamics LEDs, Steeda CAI, Steeda 93 octane SCT Tune, Steeda 22.5mm RSB, Magnaflow Catback, Enkei Raijin
[SOLD]2004 SEL Premium, 72,700 miles, Vibrant White. 35% Tint, K&N Panel filter, Remote Start, 4x Infinity Reference 6832cf, JVC KW-R800BT, Rockford Fosgate 501bd, Bazooka BT1014
1989 Mustang LX 5.0 Vert, White, T5, built motor/driveline, race suspension, fast/loud as f*ck