Question about me vs. 96-98 GT

The other night I was driving down a city street, and a 4.6 GT comes up beside me, and keeps jumping up a little, then bringing it back even, over and over. After 3-4 times, I slammed second and punched it. To my surprise, up halfway through third when I had to let off, he's still at the back of my passenger door. Well, it just so happens that we're both getting on the highway, but there is a group of cars with us. I get on first with two cars behind me, and then him. I get up to about 65, and start coasting, and he does a ricer flyby at 100+. I get over, and get up to about 80 and finally catch up to him. We back it off to 65, and I hit third. By the time I shifted to fourth I had atleast five cars on him, and just kept pulling until I let off at around 120. By the way there was no traffic while we were doing this. We had made it ahead of all of them. Shouldn't it be the other way around? Not that it should have beatin me, but shouldn't the 4.6 have a better chance of keeping up on the highway? It just seemed weird to me.
Brandon

What was funny was after I switched highways, and went up a couple miles, I came up on what I thought was another 4.6 about to be destroyed. When I got closer I noticed it was a 98 Cobra, and he sent me home with my tail between my legs.

I have a T-5. I couldn't hear his car over mine, so it's possible he could have been an auto. I have a CAI, O/R X-pipe, dumped flows, upgraded clutch, short throw, Blaster coil, 9mm wires, side-gapped plugs. I think that's it. I'll be doing a few more things to it tomorrow . Oh, and I had me (225lbs), and a buddy (275lbs) in the car. The other guy looked pretty scrawny, and was alone. What I didn't understand was how he was right with me from 35-70ish on the first pull, but from 65-120, I totally left him. I thought that their higher torque curve would help them on a highway run. As for the tuning state of his car, the car looked really clean. That's all I could tell you.
Brandon

Do a search on it. Basically, the way sparkplugs come out of the box, the spark is actually shielded from the fuel by the arm of the plug. You can cut away some of that arm, and it exposes the fuel mixture directly to the spark. It's supposed to pick up a little throttle response, and maybe a pony or two.
Brandon