Remember, It's not that the car cant go faster than 145, it's doing it at the end of the mile from a standing start!
FYI, to go 160 at Bonneville (short course, 3rd mile average) I needed 285 HP at the crank, 230 hp at the wheels.
To go 196 at Bonneville (short course, 3rd mile average) I needed 543 hp at the wheels but the course was way bad and I have a FWD.
My body (2001 Civic) is about the same frontal area as a WRX but I would suspect it's a little cleaner aero wise.
The AWD will hurt you in the low HP runs since you will not be traction limited but as the HP climbs over 300 or so it will help alot.
Just my $0.02