When i had my V5 STI i ran 12.2 @110mph with the stock VF28,
TBE, Intake, ASG Tuned. 200awkw
I think for your 11's VF34/P20 + Headers + Injectors and E85 should see you well into an 11 second. Especially with the lightness of the car. You have a great car and by the sounds of it in great condition with a 40km motor
This was one night out with 270awhp
Version 5 STI Kwinana Motorplex - YouTube