1/4 mile times are all depenedent on the launch...if the launch is shit, the time will suffer, regardless of how much power you have.
Look at this way...the way my car was back in April, i.e. 350 WHP etc etc.
I stick on a set of slicks and manage to cut a 1.7 60ft time at Shakeys or Santa Pod (or a prepped track of some sort).
As a rough guide, every 10th taken of the 60ft time is 2 10ths on the 1/4 mile.
So I did a 13.1 with a 2.3 60ft time.
In theory, with the same power output and only a 1.7 60ft time, it would drop to 11.9 seconds on the 1/4, and that's just with the launch.
It would probably be even better due to the ability to increase the low boost setting to slightly higher, thanks to the added traction.
Whatever happens bud, I wish you the best of luck...any FWD car that can run a 12 second 1/4 is damn quick and will kill most things on the road (private road of course).