Yep, all tunes will run out of steam up top with the stock turbo anyway, but the Cobb restores some easy torque the little turbo wants to make with also a few more HP down low... The Stratified will almost double those gains, scroll down to the 2nd chart
HERE to see your 91 octane gains... if you have e85 available readily and cheaply like many areas that get 91, then I'd add that to the tune as well, the e30 mix chart is the first pic... also their traction control is better than Cobb too, you just have to remember to press the button for Sport Mode to turn off the Ford one to use it, but worth the $10 for sure.