Knowing how Pulsars launch and knowing times they can do, it will be a LOT faster done right than the answers here suggest- its not a cossie you know

4.5 wouldnt be out the relms of reality, even a lot lower.

Even Celica GT4s with filter/zorst/15psi, so about the same power as you, but heavier, can do consistant 4.5s, and youve got better gearing than that.