FYI:
I have a GTS with filter/exhaust and pilots. That's it. 430-440 RWHP give or take. I raced a new Cobra with 500 RWHP, just dynoed. He had a pulley, headers/full exhaust (sounded great), tuning work done, and drag radials.
We ran from a 20 MPH roll to about 100 (short race due to traffic). I pulled about 1-2 car lengths, and the lead seemed to be getting larger, but hard to tell since we had to brake. I hooked well, so I don't think the drag radials gave him any advantage in this situation (it was about 85 degrees outside).
I consider myself a good driver, and he seemed schooled as well.... He openly admitted with street tires (stock radials) the Cobra does not hook, for whatever reason. Therefore, the drag radials and additional HP mods made it a close race in a straight line, but I still had a slight advantage.