Unfortunately I am limited with the 3,73 gears but I have gone unofficially 163-164 mph @7600 rpm. Officially 158.7 at the Mojave magnum. I had actually hit top speed in 5th gear at around the mile mark and then for some foolish reason I decided to put it in 6th to see if I could go faster and the car fell flat on it's face. Like a fat girl jumped in the trunk and invited her friends. car actually slowed down and I trapped at 158.7. I run 285/40/19 Pilot Super Sports out back. So my effective gear ratio is around 3.60 or thereabouts.
2011 Mustang GT 5.0 N/A 522 rwhp, 378rwt, Boss Intake Manifold, Comp Stage Two Cams, Livernois Ported Heads, Kooks Headers and X pipe, Wiseco Forged Pistons, Manley Rods, Polished and Balanced Forged Crank, Boss Valve Springs, Boss Oil Cooler, Boss Oil Pan, Koni Adjustable Shocks, Boss 302 Springs, Strano Front Swaybar, Cortex Watts Link, Cortex Torque Arm, Cortex Adjustable Lower Control Arm, MM Caster Camber Plates, Torsen T2r Differential, Michelin Pilot Super Sports.